diff --git a/CHANGELOG.md b/CHANGELOG.md
index 658ae46ec..5bfc336dd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,71 +2,19 @@
 
 ## [1.0.8-rc20] - unstable
 
-Chat SignalR fonctionnel de bout en bout (connexion, salons multiples,
-envoi/réception de messages), enregistreur audio et localisation dans
-PostIt, intégration Live.Avalonia démarrée, et reverse-proxy nginx
-apprêté pour WebSocket.
-
 ### Added
 
-* [PostIt] Interface de chat : page `ChatPage` (connexion au hub,
-  saisie du nom de salon, liste des messages et des membres présents),
-  entrée depuis la page d'accueil.
-* [PostIt] Envoi de messages dans un salon joint : DTO `ChatMessage`
-  (Name/Room/Message) pour l'événement `ReceiveMessage`, saisie avec
-  envoi sur `Enter`, commande inactive tant qu'aucune salle n'est en
-  focus (le hub refuse l'envoi hors salon, `LabNoJoinNoSend`).
-* [PostIt] Modèle multi-salles côté client : `JoinedRooms`,
-  `SelectedRoom` (salle en focus), messages et utilisateurs indexés par
-  salle (`FocusedMessages`/`FocusedUsers`), ComboBox de choix de la
-  salle active ; un `Join` sur une salle déjà jointe ne fait que
-  changer le focus.
-* [PostIt] Enregistreur audio (`AudioRecorder`, interface
-  `IPCMProcessor`) et ressources de localisation
-  (`Resources.{resx,en-EN,pt-PT}`).
-* [PostIt][WIP] Début d'intégration Live.Avalonia (preview XAML à
-  chaud ; encore KO).
-* [contrib] Bloc `location /chathub` dans `template.vhost` : upgrade
-  WebSocket (`Upgrade`/`Connection`), `proxy_read_timeout 3600s` et
-  `proxy_buffering off` — sans quoi la connexion SignalR tombait au
-  premier silence ou l'upgrade échouait derrière nginx.
+* [PostIt][WIP] Chat user interface 
 
-### Changed
-
-* [PostIt] `StatusNotice` déplacé de `Models` vers `ViewModels` et
-  enrichi d'une commande d'action optionnelle (`CheckCommand` +
-  `CheckCommandLabel`, interface `IWithLabel`) : le bandeau de statut
-  propose désormais l'action contextuelle (Connecter / Déconnecter /
-  Reconnecter / Vérifier la connexion).
-* [PostIt] `ChatViewModel` suit le cycle de vie complet de la
-  connexion : handlers `Reconnecting` / `Reconnected` / `Closed` de
-  `WithAutomaticReconnect`, pour refléter l'état réel au lieu d'un
-  `IsConnected` optimiste.
-* [Yavsc.Api] `AddSignalR().AddJsonProtocol(IncludeFields = true)` :
-  `ChatRoomInfo` n'expose que des champs publics, que System.Text.Json
-  ne sérialise pas par défaut — le client recevait des objets vides
-  (`Name` null, `Users` vide) et la liste des salons joints n'était
-  jamais alimentée.
-* [Yavsc.Server] `IConnexionManager.OnConnected` prend le `userName`
-  en paramètre (résolu depuis les claims dans `ChatHub`) au lieu de le
-  relire depuis un dictionnaire jamais alimenté.
-* [PostIt.Android] `network_security_config.xml` déplacé sous
-  `Resources/xml/` (chemin canonique Android).
+* [PostIt][WIP] Live.Avalonia start of integration
 
 ### Fixed
 
-* [Yavsc.Server] `KeyNotFoundException` dans
-  `HubConnectionManager.OnConnected` à chaque connexion SignalR :
-  `ChatUserNames` (et `ChatCxIds`) n'étaient jamais alimentés — relique
-  d'un `SetUserName` disparu lors d'une refactorisation. L'exception
-  dans `OnConnectedAsync` faisait fermer la connexion par le hub, et
-  PostIt affichait « Déconnecté (The server closed the connection…) »
-  immédiatement après la connexion.
-* [PostIt] URL du hub SignalR : retrait du préfixe `/api/v1` de
-  `ApiUrl` avant d'apposer `Constants.ChatHubPath` (le hub est mappé à
-  la racine du service, pas sous le préfixe versionné).
-* [PostIt] La `StatusBar` de la page chat référençait `Grid.Row="4"`
-  sur une grille à 3 rangées (rangée hors limites, bandeau invisible).
+nothing
+
+### Changed
+
+nothçing
 
 ## [1.0.8-rc19] - unstable
 
diff --git a/contrib/Makefile b/contrib/Makefile
index 5ccf773a1..deb55bcc6 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -14,7 +14,7 @@ reinstall: copy-binaries
 	@echo "💯 backend started"
 
 reinstall-prod:
-	make reinstall APP_INSTALL_PREFIX= APP_INSTALL_ENV=production
+	make reinstall APP_INSTALL_ENV= APP_INSTALL_PREFIX= APP_INSTALL_ENV=production
 
 generated/$(APP_INSTALL_PREFIX)yavscOrg.service:
 generated/$(APP_INSTALL_PREFIX)yavscBlogs.service:
diff --git a/contrib/template.vhost b/contrib/template.vhost
index b4c9c139e..ea2c2cb6d 100644
--- a/contrib/template.vhost
+++ b/contrib/template.vhost
@@ -57,25 +57,5 @@ server {
         proxy_read_timeout 100s;
         proxy_buffering off;
     }
-
-    # SignalR (ChatHub) : WebSocket exige Upgrade/Connection et un timeout
-    # long, sinon la connexion tombe au premier silence ou l'upgrade échoue.
-    # Connection est fixé à "upgrade" (pas de map $connection_upgrade, qui
-    # exigerait une directive map {} globale hors de ce vhost) : SignalR
-    # négocie toujours un upgrade sur ce chemin, et la négociation initiale
-    # (POST /negotiate, sans en-tête Upgrade) n'est pas affectée par cet
-    # en-tête côté Kestrel.
-    location /chathub {
-        proxy_pass         $BACKEND_SCHEME://$HTTP_HOST:$BACKEND_PORT;
-        proxy_http_version 1.1;
-        proxy_set_header   Upgrade $http_upgrade;
-        proxy_set_header   Connection "upgrade";
-        proxy_set_header   Host $host;
-        proxy_set_header   X-Real-IP $remote_addr;
-        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
-        proxy_set_header   X-Forwarded-Proto $scheme;
-        proxy_read_timeout 3600s;
-        proxy_buffering off;
-    }
     include server-status.conf;
-}
+}
\ No newline at end of file
diff --git a/src/PostIt/PostIt.Android/Properties/AndroidManifest.xml b/src/PostIt/PostIt.Android/Properties/AndroidManifest.xml
index 256555df1..46f0bc9bb 100644
--- a/src/PostIt/PostIt.Android/Properties/AndroidManifest.xml
+++ b/src/PostIt/PostIt.Android/Properties/AndroidManifest.xml
@@ -4,7 +4,6 @@
 		<application
       android:label="PostIt"
       android:icon="@drawable/Icon"
-			android:networkSecurityConfig="@xml/network_security_config"
-			android:hardwareAccelerated="true">
+      android:networkSecurityConfig="@xml/network_security_config">
 	</application>
 </manifest>
diff --git a/src/PostIt/PostIt.Android/Resources/xml/network_security_config.xml b/src/PostIt/PostIt.Android/Resources/network_security_config.xml
similarity index 100%
rename from src/PostIt/PostIt.Android/Resources/xml/network_security_config.xml
rename to src/PostIt/PostIt.Android/Resources/network_security_config.xml
diff --git a/src/PostIt/PostIt.Tests/EstimateEditionPageViewModelTests.cs b/src/PostIt/PostIt.Tests/EstimateEditionPageViewModelTests.cs
index 31c82387d..17efd391b 100644
--- a/src/PostIt/PostIt.Tests/EstimateEditionPageViewModelTests.cs
+++ b/src/PostIt/PostIt.Tests/EstimateEditionPageViewModelTests.cs
@@ -1,5 +1,4 @@
 using System.Net.Http;
-using PostIt.Models;
 using PostIt.ViewModels;
 using Yavsc;
 using Yavsc.Api.Client;
diff --git a/src/PostIt/PostIt.Tests/StatusBarTests.cs b/src/PostIt/PostIt.Tests/StatusBarTests.cs
index 15889e0b0..4053dbaf3 100644
--- a/src/PostIt/PostIt.Tests/StatusBarTests.cs
+++ b/src/PostIt/PostIt.Tests/StatusBarTests.cs
@@ -2,7 +2,6 @@ using Avalonia.Controls;
 using Avalonia.Headless.XUnit;
 using Avalonia.VisualTree;
 using PostIt.Controls;
-using PostIt.Models;
 using PostIt.ViewModels;
 
 namespace PostIt.Tests;
@@ -22,9 +21,7 @@ public class StatusBarTests
     [AvaloniaFact]
     public void Status_message_is_rendered_by_a_SelectableTextBlock()
     {
-        var bar = new StatusBar {
-            DataContext =
-            StatusNotice.Error("Échec de la suppression : boom") };
+        var bar = new StatusBar { DataContext = StatusNotice.Error("Échec de la suppression : boom") };
         var window = new Window { Content = bar };
         window.Show();
 
@@ -35,4 +32,4 @@ public class StatusBarTests
         Assert.NotNull(message);
         Assert.Equal("Échec de la suppression : boom", message!.Text);
     }
-}
+}
\ No newline at end of file
diff --git a/src/PostIt/PostIt/Controls/StatusBar.axaml b/src/PostIt/PostIt/Controls/StatusBar.axaml
index 755ff7d3e..2f46fee33 100644
--- a/src/PostIt/PostIt/Controls/StatusBar.axaml
+++ b/src/PostIt/PostIt/Controls/StatusBar.axaml
@@ -10,19 +10,16 @@
             Padding="8">
         <StackPanel Orientation="Horizontal" Spacing="8">
             <TextBlock Text="{Binding Glyph}"
-              FontWeight="Bold"
-              Foreground="{Binding Foreground}"
-              VerticalAlignment="Top"/>
+                       FontWeight="Bold"
+                       Foreground="{Binding Foreground}"
+                       VerticalAlignment="Top"/>
+            <!-- SelectableTextBlock so the user can select + copy the
+                 status message (TextBlock is not selectable in
+                 Avalonia). Keeps Text/TextWrapping/Foreground. -->
             <SelectableTextBlock Text="{Binding Message}"
-              Foreground="{Binding Foreground}"
-              TextWrapping="Wrap"
-              VerticalAlignment="Center"/>
-            <Button Content="{Binding CheckCommandLabel}"
-                Foreground="{Binding Foreground}"
-                    VerticalAlignment="Center"
-                    IsVisible="{Binding HasCheckCommand}"
-                    Command="{Binding CheckCommand}"
-                    />
+                       Foreground="{Binding Foreground}"
+                       TextWrapping="Wrap"
+                       VerticalAlignment="Center"/>
         </StackPanel>
     </Border>
 </UserControl>
diff --git a/src/PostIt/PostIt/Models/ChatMessage.cs b/src/PostIt/PostIt/Models/ChatMessage.cs
deleted file mode 100644
index 52733311a..000000000
--- a/src/PostIt/PostIt/Models/ChatMessage.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-namespace PostIt.ViewModels.Chat
-{
-    /// <summary>
-    /// DTO de message de salon, calqué sur la charge envoyée par
-    /// <c>ChatHub.Send</c> côté serveur ({ Name, Room, Message }).
-    /// Le protocole JSON de SignalR sérialise en camelCase ; la
-    /// désérialisation est insensible à la casse par défaut.
-    /// </summary>
-    public class ChatMessage
-    {
-        public string? Name { get; set; }
-        public string? Room { get; set; }
-        public string? Message { get; set; }
-    }
-}
diff --git a/src/PostIt/PostIt/Models/ChatMessageDto.cs b/src/PostIt/PostIt/Models/ChatMessageDto.cs
deleted file mode 100644
index b93ccbe29..000000000
--- a/src/PostIt/PostIt/Models/ChatMessageDto.cs
+++ /dev/null
@@ -1,14 +0,0 @@
-namespace PostIt.ViewModels.Chat
-{
-    /// <summary>
-    /// DTO minimal calqué sur l'objet anonyme émis par le hub
-    /// (<c>{ Name, Room, Message }</c>) via l'événement
-    /// <c>ReceiveMessage</c>.
-    /// </summary>
-    public class ChatMessageDto
-    {
-        public string? Name { get; set; }
-        public string? Room { get; set; }
-        public string? Message { get; set; }
-    }
-}
diff --git a/src/PostIt/PostIt/Models/IWithLabel.cs b/src/PostIt/PostIt/Models/IWithLabel.cs
deleted file mode 100644
index b76f912db..000000000
--- a/src/PostIt/PostIt/Models/IWithLabel.cs
+++ /dev/null
@@ -1,6 +0,0 @@
-namespace PostIt.ViewModels;
-
-internal interface IWithLabel
-{
-    string Label { get; }
-}
diff --git a/src/PostIt/PostIt/Models/StatusNotice.cs b/src/PostIt/PostIt/Models/StatusNotice.cs
new file mode 100644
index 000000000..c50ac3503
--- /dev/null
+++ b/src/PostIt/PostIt/Models/StatusNotice.cs
@@ -0,0 +1,35 @@
+namespace PostIt.ViewModels;
+
+public enum StatusSeverity
+{
+    Info,
+    Warning,
+    Error
+}
+
+public sealed class StatusNotice
+{
+    public string Message { get; }
+    public StatusSeverity Severity { get; }
+    public string Glyph { get; }
+    public string Background { get; }
+    public string BorderBrush { get; }
+    public string Foreground { get; }
+
+    public StatusNotice(string message, StatusSeverity severity)
+    {
+        Message = string.IsNullOrWhiteSpace(message) ? "Pret." : message;
+        Severity = severity;
+
+        (Glyph, Background, BorderBrush, Foreground) = severity switch
+        {
+            StatusSeverity.Error => ("!", "#7F1D1D", "#C62828", "#e1f0f6"),
+            StatusSeverity.Warning => ("~", "#7C4A03", "#E6A700", "#eaeaea"),
+            _ => ("i", "#E8F0FE", "#5B8DEF", "#1E3A8A"),
+        };
+    }
+
+    public static StatusNotice Info(string message) => new(message, StatusSeverity.Info);
+    public static StatusNotice Warning(string message) => new(message, StatusSeverity.Warning);
+    public static StatusNotice Error(string message) => new(message, StatusSeverity.Error);
+}
diff --git a/src/PostIt/PostIt/Models/StatusSeverity.cs b/src/PostIt/PostIt/Models/StatusSeverity.cs
deleted file mode 100644
index eb6ef4502..000000000
--- a/src/PostIt/PostIt/Models/StatusSeverity.cs
+++ /dev/null
@@ -1,8 +0,0 @@
-namespace PostIt.Models;
-
-public enum StatusSeverity
-{
-    Info,
-    Warning,
-    Error
-}
diff --git a/src/PostIt/PostIt/ViewModels/ACL/CirclesPageViewModel.cs b/src/PostIt/PostIt/ViewModels/ACL/CirclesPageViewModel.cs
index 6201c061b..cd068b4f4 100644
--- a/src/PostIt/PostIt/ViewModels/ACL/CirclesPageViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/ACL/CirclesPageViewModel.cs
@@ -5,7 +5,7 @@ using Avalonia;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using Microsoft.Extensions.DependencyInjection;
-using PostIt.Models;
+using PostIt.Helpers;
 using PostIt.Services;
 using Yavsc.Api.Client;
 using Yavsc.Api.Client.Dtos;
diff --git a/src/PostIt/PostIt/ViewModels/ACL/PostAclDialogViewModel.cs b/src/PostIt/PostIt/ViewModels/ACL/PostAclDialogViewModel.cs
index 43ed60823..be1b220fa 100644
--- a/src/PostIt/PostIt/ViewModels/ACL/PostAclDialogViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/ACL/PostAclDialogViewModel.cs
@@ -12,7 +12,6 @@ using Yavsc.Api.Client.Dtos;
 using Yavsc.Abstract.BlogSpot;
 using Yavsc.Abstract.Identity.Security;
 using System.Net.Http;
-using PostIt.Models;
 
 namespace PostIt.ViewModels;
 
diff --git a/src/PostIt/PostIt/ViewModels/Activity/ActivitiesPageViewModel.cs b/src/PostIt/PostIt/ViewModels/Activity/ActivitiesPageViewModel.cs
index 1890309ec..bd13faf9b 100644
--- a/src/PostIt/PostIt/ViewModels/Activity/ActivitiesPageViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Activity/ActivitiesPageViewModel.cs
@@ -8,7 +8,6 @@ using Avalonia;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using PostIt.Helpers;
-using PostIt.Models;
 using Yavsc.Abstract.Workflow;
 using Yavsc.Api.Client;
 
diff --git a/src/PostIt/PostIt/ViewModels/Activity/BillingQueriesPageViewModel.cs b/src/PostIt/PostIt/ViewModels/Activity/BillingQueriesPageViewModel.cs
index 5cd373708..f1b05b749 100644
--- a/src/PostIt/PostIt/ViewModels/Activity/BillingQueriesPageViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Activity/BillingQueriesPageViewModel.cs
@@ -12,7 +12,6 @@ using PostIt.Helpers;
 using Yavsc;
 using Yavsc.Api.Client;
 using Yavsc.Abstract.Workflow;
-using PostIt.Models;
 
 namespace PostIt.ViewModels;
 
diff --git a/src/PostIt/PostIt/ViewModels/Activity/BillingQueryDetailsPageViewModel.cs b/src/PostIt/PostIt/ViewModels/Activity/BillingQueryDetailsPageViewModel.cs
index 0df05b21a..c9f122dce 100644
--- a/src/PostIt/PostIt/ViewModels/Activity/BillingQueryDetailsPageViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Activity/BillingQueryDetailsPageViewModel.cs
@@ -388,4 +388,4 @@ public partial class BillingQueryDetailsPageViewModel : ViewModelBase, IActionSt
             QueryStatus.Success => "V",
             _ => "i",
         };
-}
+}
\ No newline at end of file
diff --git a/src/PostIt/PostIt/ViewModels/Activity/CommandFormsPageViewModel.cs b/src/PostIt/PostIt/ViewModels/Activity/CommandFormsPageViewModel.cs
index 14e7e74b9..533fbc380 100644
--- a/src/PostIt/PostIt/ViewModels/Activity/CommandFormsPageViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Activity/CommandFormsPageViewModel.cs
@@ -6,7 +6,6 @@ using Avalonia;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using PostIt.Helpers;
-using PostIt.Models;
 using Yavsc.Abstract.Workflow;
 using Yavsc.Api.Client;
 
diff --git a/src/PostIt/PostIt/ViewModels/Activity/EstimateEditionPageViewModel.cs b/src/PostIt/PostIt/ViewModels/Activity/EstimateEditionPageViewModel.cs
index f8f94436a..1f1e4b4be 100644
--- a/src/PostIt/PostIt/ViewModels/Activity/EstimateEditionPageViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Activity/EstimateEditionPageViewModel.cs
@@ -10,7 +10,6 @@ using Avalonia;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using PostIt.Helpers;
-using PostIt.Models;
 using Yavsc.Api.Client;
 
 namespace PostIt.ViewModels;
diff --git a/src/PostIt/PostIt/ViewModels/Activity/EstimateListPageViewModel.cs b/src/PostIt/PostIt/ViewModels/Activity/EstimateListPageViewModel.cs
index 766dda903..c90a6d884 100644
--- a/src/PostIt/PostIt/ViewModels/Activity/EstimateListPageViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Activity/EstimateListPageViewModel.cs
@@ -9,7 +9,6 @@ using Avalonia;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using PostIt.Helpers;
-using PostIt.Models;
 using Yavsc.Api.Client;
 
 namespace PostIt.ViewModels;
diff --git a/src/PostIt/PostIt/ViewModels/Activity/ProviderOngoingRequestsPageViewModel.cs b/src/PostIt/PostIt/ViewModels/Activity/ProviderOngoingRequestsPageViewModel.cs
index 360bf54ad..7fd84fd88 100644
--- a/src/PostIt/PostIt/ViewModels/Activity/ProviderOngoingRequestsPageViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Activity/ProviderOngoingRequestsPageViewModel.cs
@@ -13,7 +13,6 @@ using PostIt.Helpers;
 using Yavsc;
 using Yavsc.Abstract.Workflow;
 using Yavsc.Api.Client;
-using PostIt.Models;
 
 namespace PostIt.ViewModels;
 
diff --git a/src/PostIt/PostIt/ViewModels/Blogs/BlogsViewModel.cs b/src/PostIt/PostIt/ViewModels/Blogs/BlogsViewModel.cs
index 6fe6eccc9..a1e016e7f 100644
--- a/src/PostIt/PostIt/ViewModels/Blogs/BlogsViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Blogs/BlogsViewModel.cs
@@ -12,7 +12,6 @@ using Yavsc.Api.Client;
 using Yavsc.Abstract.Files;
 using PostIt.Helpers;
 using AvaloniaEdit.Document;
-using PostIt.Models;
 
 namespace PostIt.ViewModels;
 
diff --git a/src/PostIt/PostIt/Models/ChatRoomInfo.cs b/src/PostIt/PostIt/ViewModels/Chat/ChatRoomInfo.cs
similarity index 100%
rename from src/PostIt/PostIt/Models/ChatRoomInfo.cs
rename to src/PostIt/PostIt/ViewModels/Chat/ChatRoomInfo.cs
diff --git a/src/PostIt/PostIt/ViewModels/Chat/ChatViewModel.cs b/src/PostIt/PostIt/ViewModels/Chat/ChatViewModel.cs
index ba452cb4a..85392cfb1 100644
--- a/src/PostIt/PostIt/ViewModels/Chat/ChatViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Chat/ChatViewModel.cs
@@ -1,42 +1,21 @@
 using System;
-using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using Microsoft.AspNetCore.SignalR.Client;
-using Microsoft.Extensions.DependencyInjection;
-using PostIt.Models;
-using PostIt.Services;
-using Yavsc;
 
 namespace PostIt.ViewModels.Chat
 {
-    /// <summary>
-    /// ViewModel pour la gestion du chat,
-    /// incluant la connexion au Hub SignalR,
-    /// la gestion des salons et des utilisateurs connectés.
-    /// </summary>
 
     public partial class ChatViewModel : ViewModelBase
     {
-        private readonly Settings _settings;
-        private readonly YavscApiClient? _api;
-
-        // Le paramètre optionnel permet l'instanciation design-time
-        // (Design.DataContext dans ChatPage.axaml) sans conteneur DI.
-        public ChatViewModel(YavscApiClient? api = null)
-        {
-            var app = App.Current as App;
-            _settings = app!.ServiceProvider!.GetRequiredService<Settings>(); // Assurez-vous que _settings est initialisé avant utilisation.
-            _api = api;
-            Status = new StatusNotice("Déconnecté", StatusSeverity.Info,
-            new RelayCheckCommand("Connecter", async () => await ConnectAsync()));
-            FocusedMessages = _systemMessages;
-        }
-
         private HubConnection? _connection;
 
+        [ObservableProperty]
+        public partial string ServerUrl { get; protected set; } = "http://localhost:5000/chathub";
+
+
         [ObservableProperty]
         public partial string CurrentRoom { get; set; } =  "General";
 
@@ -45,56 +24,14 @@ namespace PostIt.ViewModels.Chat
 
         [ObservableProperty]
         public partial StatusNotice Status { get; set; }
+                = new StatusNotice("Déconnecté", StatusSeverity.Info);
 
         [ObservableProperty]
-        [NotifyCanExecuteChangedFor(nameof(SendMessageCommand))]
         public partial bool IsConnected { get; set; } = false;
 
-        [ObservableProperty]
-        [NotifyCanExecuteChangedFor(nameof(SendMessageCommand))]
-        public partial string MessageToSend { get; set; } = "";
-
-        // Salles jointes (choix de la salle en focus dans la vue).
-        public ObservableCollection<string> JoinedRooms { get; } = new();
-
-        // Salle en focus ; null = aucune salle, le journal affiche
-        // alors les notifications système.
-        [ObservableProperty]
-        [NotifyCanExecuteChangedFor(nameof(SendMessageCommand))]
-        public partial string? SelectedRoom { get; set; }
-
-        // Notifications globales (connexion, erreurs de join, ...)
-        private readonly ObservableCollection<string> _systemMessages = new();
-
-        // Messages et utilisateurs présents, indexés par salle.
-        private readonly Dictionary<string, ObservableCollection<string>> _messagesByRoom = new();
-        private readonly Dictionary<string, ObservableCollection<string>> _usersByRoom = new();
-        private static readonly ObservableCollection<string> _noUsers = new();
-
-        // Vues "focus" exposées à la page : pointent vers la salle
-        // sélectionnée, ou vers le journal système / une liste vide.
-        [ObservableProperty]
-        public partial ObservableCollection<string> FocusedMessages { get; set; }
-
-        [ObservableProperty]
-        public partial ObservableCollection<string> FocusedUsers { get; set; } = _noUsers;
-
-        partial void OnSelectedRoomChanged(string? value)
-        {
-            FocusedMessages = value != null && _messagesByRoom.TryGetValue(value, out var msgs)
-                ? msgs : _systemMessages;
-            FocusedUsers = value != null && _usersByRoom.TryGetValue(value, out var users)
-                ? users : _noUsers;
-        }
-
-        // Trace une notification système dans la vue courante
-        // (et dans le journal global pour consultation ultérieure).
-        private void Log(string line)
-        {
-            _systemMessages.Add(line);
-            if (!ReferenceEquals(FocusedMessages, _systemMessages))
-                FocusedMessages.Add(line);
-        }
+        // Listes dynamiques pour l'UI
+        public ObservableCollection<string> Messages { get; } = new();
+        public ObservableCollection<string> ConnectedUsers { get; } = new();
 
         // Commandes pour les boutons
         [RelayCommand]
@@ -103,88 +40,20 @@ namespace PostIt.ViewModels.Chat
         [RelayCommand]
         public async Task JoinRoomCommand() => await JoinRoomAsync();
 
-        // Le serveur (ChatHub.Send) refuse tout message d'un utilisateur
-        // qui n'a pas joint le salon ("NoJoinNoSend") : on garde la
-        // commande inactive tant qu'aucune salle n'est en focus.
-        private bool CanSendMessage() =>
-            IsConnected && SelectedRoom != null && !string.IsNullOrWhiteSpace(MessageToSend);
-
-        [RelayCommand(CanExecute = nameof(CanSendMessage))]
-        private async Task SendMessageAsync()
-        {
-            if (_connection == null || SelectedRoom == null) return;
-            var text = MessageToSend.Trim();
-            try
-            {
-                await _connection.InvokeAsync("Send", SelectedRoom, text);
-                MessageToSend = string.Empty;
-            }
-            catch (Exception ex)
-            {
-                Log($"Erreur d'envoi : {ex.Message}");
-            }
-        }
+        [RelayCommand]
+        public async Task ChangeNickCommand() => await ChangeNickAsync();
 
         public override bool CanNavigateNext { get; protected set; } = false;
         public override bool CanNavigatePrevious { get; protected set; } = true;
 
-        private async Task DisconnectAsync()
-        {
-            if (_connection != null)
-            {
-                await _connection.StopAsync();
-                await _connection.DisposeAsync();
-                _connection = null;
-            }
-            IsConnected = false;
-            SelectedRoom = null;
-            JoinedRooms.Clear();
-            _messagesByRoom.Clear();
-            _usersByRoom.Clear();
-            _systemMessages.Clear();
-            Status = new StatusNotice("Déconnecté", StatusSeverity.Info,
-             new RelayCheckCommand("Connecter", async () => await ConnectAsync()));
-        }
-
         private async Task ConnectAsync()
         {
             try
             {
-                Status = new StatusNotice("Connexion en cours...", StatusSeverity.Info,
-                 new RelayCheckCommand("Vérifier la connexion", async () => await CheckConnectionAsync()));
-
-                if (_api == null || !_api.HasValidSession)
-                {
-                    Status = new StatusNotice("Session expirée : reconnectez-vous avant d'ouvrir le chat.", StatusSeverity.Error,
-                    new RelayCheckCommand("Reconnecter", async () => await ConnectAsync()));
-                    return;
-                }
-
-                // Le hub est mappé à la racine du service ("/chathub"),
-                // pas sous le préfixe versionné "/api/v1" : on le retire.
-                var hubBase = _settings.ApiUrl.TrimEnd('/');
-                if (hubBase.EndsWith("/api/v1", StringComparison.OrdinalIgnoreCase))
-                    hubBase = hubBase[..^"/api/v1".Length];
-                var hubUrl = hubBase + "/" + Constants.ChatHubPath;
+                Status = new StatusNotice("Connexion en cours...", StatusSeverity.Info);
 
                 _connection = new HubConnectionBuilder()
-                    .WithUrl(hubUrl,
-
-                    options =>
-                    {
-                        // Le hub est [Authorize] : on attache le Bearer OIDC.
-                        // AccessTokenProvider est rappelé à chaque reconnexion,
-                        // donc on tente un refresh silencieux à chaque appel.
-                        // Un refresh mort (invalid_grant) ne doit pas faire
-                        // échouer StartAsync avec une exception interne : on
-                        // renvoie le token courant (éventuellement expiré) et
-                        // le serveur répondra un 401 propre, surfacé à l'UI.
-                        options.AccessTokenProvider = async () =>
-                        {
-                            await _api.TrySilentLoginAsync();
-                            return _api.CurrentAccessToken;
-                        };
-                    })
+                    .WithUrl(ServerUrl)
                     .WithAutomaticReconnect()
                     .Build();
 
@@ -192,7 +61,7 @@ namespace PostIt.ViewModels.Chat
                 _connection.On<string, string, string>("notifyUser", (type, user, msg) =>
                 {
                     Avalonia.Threading.Dispatcher.UIThread.Post(() =>
-                        Log($"[{type}] {user}: {msg}"));
+                        Messages.Add($"[{type}] {user}: {msg}"));
                 });
 
                 // 2. Ecoute des notifications de salon (notifyRoom)
@@ -200,153 +69,66 @@ namespace PostIt.ViewModels.Chat
                 {
                     Avalonia.Threading.Dispatcher.UIThread.Post(() =>
                     {
-                        if (_messagesByRoom.TryGetValue(room, out var roomLog))
-                            roomLog.Add($"*{user} a interagi avec le salon {room} (Action: {type})");
-                        else
-                            Log($"*{user} a interagi avec le salon {room} (Action: {type})");
-                        if (type == "UserJoin" && _usersByRoom.TryGetValue(room, out var users)
-                            && !users.Contains(user))
-                            users.Add(user);
+                        Messages.Add($"*{user} a interagi avec le salon {room} (Action: {type})");
+                        if (type == "UserJoin" && !ConnectedUsers.Contains(user))
+                            ConnectedUsers.Add(user);
                     });
                 });
 
                 // 3. Réception de l'état complet suite au Join réussi (joint)
                 _connection.On<ChatRoomInfo>("joint", (roomInfo) =>
-                {
-                    Avalonia.Threading.Dispatcher.UIThread.Post(() => OnRoomJoined(roomInfo));
-                });
-
-                // 4. Réception des messages de salon (diffusés par ChatHub.Send)
-                _connection.On<ChatMessage>("ReceiveMessage", (msg) =>
                 {
                     Avalonia.Threading.Dispatcher.UIThread.Post(() =>
                     {
-                        var room = msg.Room ?? "?";
-                        if (!_messagesByRoom.TryGetValue(room, out var roomLog))
-                            roomLog = _messagesByRoom[room] = new();
-                        roomLog.Add($"{msg.Name} : {msg.Message}");
+                        Messages.Add($"Salon rejoint avec succès : {roomInfo.Name}");
+                        ConnectedUsers.Clear();
+                        foreach (var u in roomInfo.Users) ConnectedUsers.Add(u);
                     });
                 });
 
                 await _connection.StartAsync();
                 IsConnected = true;
-                Status = new StatusNotice("Connecté au Hub SignalR", StatusSeverity.Info, new RelayCheckCommand("Déconnecter", async () => await DisconnectAsync()));
-
-                // WithAutomaticReconnect ne lève pas d'exception en cas de
-                // perte réseau : l'état passe par Reconnecting/Closed. Sans
-                // ces handlers, IsConnected resterait optimiste et Join()
-                // échouerait avec "connection is not active".
-                _connection.Reconnecting += error =>
-                {
-                    Avalonia.Threading.Dispatcher.UIThread.Post(() =>
-                    {
-                        IsConnected = false;
-                        Status = new StatusNotice($"Connexion perdue ({error?.Message ?? "réseau"}), reconnexion...", StatusSeverity.Error,
-                            new RelayCheckCommand("Déconnecter", async () => await DisconnectAsync()));
-                    });
-                    return Task.CompletedTask;
-                };
-                _connection.Reconnected += _ =>
-                {
-                    Avalonia.Threading.Dispatcher.UIThread.Post(() =>
-                    {
-                        IsConnected = true;
-                        Status = new StatusNotice("Reconnecté au Hub SignalR", StatusSeverity.Info,
-                            new RelayCheckCommand("Déconnecter", async () => await DisconnectAsync()));
-                    });
-                    return Task.CompletedTask;
-                };
-                _connection.Closed += error =>
-                {
-                    Avalonia.Threading.Dispatcher.UIThread.Post(() =>
-                    {
-                        IsConnected = false;
-                        Status = new StatusNotice($"Déconnecté ({error?.Message ?? "fin de connexion"})", StatusSeverity.Info,
-                            new RelayCheckCommand("Connecter", async () => await ConnectAsync()));
-                    });
-                    return Task.CompletedTask;
-                };
+                Status = new StatusNotice("Connecté au Hub SignalR", StatusSeverity.Info);
             }
             catch (Exception ex)
             {
-                Status = new StatusNotice($"Erreur : {ex.Message}", StatusSeverity.Error, new RelayCheckCommand("Reconnecter", async () => await ConnectAsync()));
+                Status = new StatusNotice($"Erreur : {ex.Message}", StatusSeverity.Error);
                 IsConnected = false;
             }
         }
 
-        // Alimente JoinedRooms et les collections par salle à partir
-        // du ChatRoomInfo renvoyé par le hub (valeur de retour du Join
-        // et/ou événement "joint"). Idempotent.
-        private void OnRoomJoined(ChatRoomInfo roomInfo)
-        {
-            // ChatHub.Join renseigne toujours Name (salle existante ou
-            // créée) ; un Name nul signalerait un payload inattendu.
-            var roomName = roomInfo.Name ?? CurrentRoom;
-            if (roomInfo.Name == null)
-                Log("OnRoomJoined : nom de salle absent du payload, repli sur la salle demandée.");
-            if (!_messagesByRoom.TryGetValue(roomName, out var roomLog))
-                roomLog = _messagesByRoom[roomName] = new();
-            roomLog.Add($"Salon rejoint avec succès : {roomName}");
-            var users = _usersByRoom[roomName] = new();
-            foreach (var u in roomInfo.Users) users.Add(u);
-            if (!JoinedRooms.Contains(roomName))
-                JoinedRooms.Add(roomName);
-            SelectedRoom = roomName;
-        }
-
-        private Task CheckConnectionAsync()
-        {
-            var state = _connection?.State.ToString() ?? "aucune connexion";
-            Log($"État de la connexion : {state}");
-            return Task.CompletedTask;
-        }
-
         private async Task JoinRoomAsync()
         {
             if (_connection == null || string.IsNullOrWhiteSpace(CurrentRoom)) return;
 
-            // Salle déjà jointe : on se contente de la mettre en focus.
-            if (JoinedRooms.Contains(CurrentRoom))
-            {
-                SelectedRoom = CurrentRoom;
-                return;
-            }
-
-            // InvokeCoreAsync exige une connexion active : avec la
-            // reconnexion automatique, l'état peut être Reconnecting au
-            // moment de l'appel. On tente une (re)connexion si nécessaire.
-            if (_connection.State != HubConnectionState.Connected)
-            {
-                Log($"Connexion non active ({_connection.State}), tentative de reconnexion...");
-                try
-                {
-                    await _connection.StartAsync();
-                }
-                catch (Exception ex)
-                {
-                    Log($"Reconnexion impossible : {ex.Message}");
-                    return;
-                }
-            }
-
             try
             {
                 // Appel de la méthode publique 'Join' du Hub (renvoie un ChatRoomInfo)
                 var info = await _connection.InvokeAsync<ChatRoomInfo>("Join", CurrentRoom);
                 if (info == null)
                 {
-                    Log("Erreur lors de la validation du salon par le serveur.");
-                }
-                else
-                {
-                    // On alimente le modèle depuis la valeur de retour,
-                    // sans attendre l'événement "joint".
-                    OnRoomJoined(info);
+                    Messages.Add("Erreur lors de la validation du salon par le serveur.");
                 }
             }
             catch (Exception ex)
             {
-                Log($"Erreur Join: {ex.Message}");
+                Messages.Add($"Erreur Join: {ex.Message}");
+            }
+        }
+
+        private async Task ChangeNickAsync()
+        {
+            if (_connection == null || string.IsNullOrWhiteSpace(NickName)) return;
+
+            try
+            {
+                // Appel de la méthode publique 'Nick' du Hub (void)
+                await _connection.InvokeAsync("Nick", NickName);
+                Messages.Add($"Demande de changement de pseudo vers '{NickName}' envoyée.");
+            }
+            catch (Exception ex)
+            {
+                Messages.Add($"Erreur Nick: {ex.Message}");
             }
         }
     }
diff --git a/src/PostIt/PostIt/ViewModels/Chat/RelayCheckCommand.cs b/src/PostIt/PostIt/ViewModels/Chat/RelayCheckCommand.cs
deleted file mode 100644
index 909d7a859..000000000
--- a/src/PostIt/PostIt/ViewModels/Chat/RelayCheckCommand.cs
+++ /dev/null
@@ -1,33 +0,0 @@
-using System;
-using System.Threading.Tasks;
-using System.Windows.Input;
-
-namespace PostIt.ViewModels.Chat
-{
-    internal class RelayCheckCommand : ICommand, IWithLabel
-    {
-        public string Label { get; }
-        private Func<Task> value;
-
-        public RelayCheckCommand(string v, Func<Task> value)
-        {
-            this.Label = v;
-            this.value = value;
-        }
-
-        public event EventHandler? CanExecuteChanged;
-
-        public bool CanExecute(object? parameter)
-        {
-            return value != null;
-        }
-
-        public void Execute(object? parameter)
-        {
-            if (value != null)
-            {
-                _ = value();
-            }
-        }
-    }
-}
diff --git a/src/PostIt/PostIt/ViewModels/Commands/BillingCommandPageViewModel.cs b/src/PostIt/PostIt/ViewModels/Commands/BillingCommandPageViewModel.cs
index 4898c9560..5ad2b08f4 100644
--- a/src/PostIt/PostIt/ViewModels/Commands/BillingCommandPageViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Commands/BillingCommandPageViewModel.cs
@@ -2,7 +2,6 @@ using System;
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
-using PostIt.Models;
 using Yavsc;
 using Yavsc.Abstract.Workflow;
 using Yavsc.Api.Client;
diff --git a/src/PostIt/PostIt/ViewModels/Commands/BrushViewModel.cs b/src/PostIt/PostIt/ViewModels/Commands/BrushViewModel.cs
index 1b1847e96..72d9ce8ea 100644
--- a/src/PostIt/PostIt/ViewModels/Commands/BrushViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Commands/BrushViewModel.cs
@@ -6,7 +6,6 @@ using System.Net;
 using System.Net.Http;
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.ComponentModel;
-using PostIt.Models;
 using Yavsc.Abstract.Workflow;
 using Yavsc.Api.Client;
 using Yavsc.Models.Billing;
diff --git a/src/PostIt/PostIt/ViewModels/Layout/ActionStatusViewModelExtensions.cs b/src/PostIt/PostIt/ViewModels/Layout/ActionStatusViewModelExtensions.cs
index 9fe286ac0..614d477c8 100644
--- a/src/PostIt/PostIt/ViewModels/Layout/ActionStatusViewModelExtensions.cs
+++ b/src/PostIt/PostIt/ViewModels/Layout/ActionStatusViewModelExtensions.cs
@@ -1,5 +1,3 @@
-using PostIt.Models;
-
 namespace PostIt.ViewModels;
 
 public interface IActionStatusViewModel
@@ -31,4 +29,4 @@ public static class ActionStatusViewModelExtensions
             _ => StatusNotice.Info(normalizedMessage),
         };
     }
-}
+}
\ No newline at end of file
diff --git a/src/PostIt/PostIt/ViewModels/MyFiles/MyFilesViewModel.cs b/src/PostIt/PostIt/ViewModels/MyFiles/MyFilesViewModel.cs
index 169b29b16..cc4b46828 100644
--- a/src/PostIt/PostIt/ViewModels/MyFiles/MyFilesViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/MyFiles/MyFilesViewModel.cs
@@ -7,7 +7,6 @@ using Avalonia;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using PostIt.Helpers;
-using PostIt.Models;
 using Yavsc.Api.Client;
 
 namespace PostIt.ViewModels;
@@ -227,4 +226,4 @@ public partial class MyFilesViewModel : ViewModelBase, IActionStatusViewModel
         var idx = current.LastIndexOf('/');
         return idx < 0 ? string.Empty : current[..idx];
     }
-}
+}
\ No newline at end of file
diff --git a/src/PostIt/PostIt/ViewModels/Settings/Settings.cs b/src/PostIt/PostIt/ViewModels/Settings/Settings.cs
index 72eea5d35..c034437b8 100644
--- a/src/PostIt/PostIt/ViewModels/Settings/Settings.cs
+++ b/src/PostIt/PostIt/ViewModels/Settings/Settings.cs
@@ -9,7 +9,6 @@ using System.Net.Http;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 using System.Globalization;
-using PostIt.Models;
 
 [assembly: InternalsVisibleTo("PostIt.Tests")]
 
diff --git a/src/PostIt/PostIt/ViewModels/StatusNotice.cs b/src/PostIt/PostIt/ViewModels/StatusNotice.cs
deleted file mode 100644
index 404287dbe..000000000
--- a/src/PostIt/PostIt/ViewModels/StatusNotice.cs
+++ /dev/null
@@ -1,40 +0,0 @@
-using System.Windows.Input;
-using PostIt.Models;
-
-namespace PostIt.ViewModels;
-
-public sealed class StatusNotice
-{
-    public string Message { get; }
-    public StatusSeverity Severity { get; }
-    public string Glyph { get; }
-    public string Background { get; }
-    public string BorderBrush { get; }
-    public string Foreground { get; }
-
-    public bool HasCheckCommand { get => CheckCommand != null; }
-
-    public ICommand? CheckCommand { get; }
-
-    public string CheckCommandLabel { get; }
-
-    public StatusNotice(string message, StatusSeverity severity, ICommand? checkCommand)
-    {
-        Message = string.IsNullOrWhiteSpace(message) ? "Pret." : message;
-        Severity = severity;
-
-        (Glyph, Background, BorderBrush, Foreground) = severity switch
-        {
-            StatusSeverity.Error => ("!", "#7F1D1D", "#C62828", "#e1f0f6"),
-            StatusSeverity.Warning => ("~", "#7C4A03", "#E6A700", "#eaeaea"),
-            _ => ("i", "#E8F0FE", "#5B8DEF", "#1E3A8A"),
-        };
-        CheckCommand = checkCommand;
-        CheckCommandLabel = HasCheckCommand ?
-                (checkCommand is IWithLabel labeled ? labeled.Label : "Check") : string.Empty;
-    }
-
-    public static StatusNotice Info(string message, ICommand? checkCommand = null) => new(message, StatusSeverity.Info, checkCommand);
-    public static StatusNotice Warning(string message, ICommand? checkCommand = null) => new(message, StatusSeverity.Warning, checkCommand);
-    public static StatusNotice Error(string message, ICommand? checkCommand = null) => new(message, StatusSeverity.Error, checkCommand);
-}
diff --git a/src/PostIt/PostIt/Views/Chat/ChatPage.axaml b/src/PostIt/PostIt/Views/Chat/ChatPage.axaml
index 4749736a7..0ac7e818c 100644
--- a/src/PostIt/PostIt/Views/Chat/ChatPage.axaml
+++ b/src/PostIt/PostIt/Views/Chat/ChatPage.axaml
@@ -1,5 +1,4 @@
 <ContentPage
-  x:Class="PostIt.Views.Chat.ChatPage"
   xmlns="https://github.com/avaloniaui"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:AvaloniaEdit="clr-namespace:AvaloniaEdit;assembly=AvaloniaEdit"
@@ -10,102 +9,38 @@
   xmlns:postitControls="using:PostIt.Controls"
   xmlns:views="using:PostIt.Views.Chat"
   xmlns:vm="using:PostIt.ViewModels.Chat"
-  x:DataType="vm:ChatViewModel"
-  >
-  <Design.DataContext>
-    <vm:ChatViewModel />
-  </Design.DataContext>
+  x:Class="PostIt.Views.Chat.ChatPage"
+  x:DataType="vm:ChatViewModel" >
 
-  <Grid Margin="10" RowDefinitions="Auto, *, Auto, Auto">
+    <Grid RowDefinitions="Auto, *, Auto" Margin="10">
 
-    <Grid
-      Grid.Row="1"
-      Margin="0,0,0,10"
-      ColumnDefinitions="*, 200">
+        <Grid Grid.Row="1" ColumnDefinitions="*, 200" Margin="0,0,0,10">
 
-      <!--  Journal des flux de messages & notifications  -->
-      <Grid Grid.Column="0" RowDefinitions="Auto, *">
-        <StackPanel
-          Grid.Row="0"
-          Margin="0,0,0,5"
-          Orientation="Horizontal"
-          Spacing="10">
-          <TextBox
-            Width="200"
-            VerticalAlignment="Center"
-            Text="{Binding CurrentRoom}"
-            PlaceholderText="Nom du salon" />
-          <Button Command="{Binding JoinRoomCommand}" Content="Rejoindre Salon (Join)" />
-          <!--  Choix de la salle en focus parmi celles jointes  -->
-          <ComboBox
-            Width="180"
-            VerticalAlignment="Center"
-            ItemsSource="{Binding JoinedRooms}"
-            PlaceholderText="Salle active"
-            SelectedItem="{Binding SelectedRoom}" />
-        </StackPanel>
+            <!-- Journal des flux de messages & notifications -->
+            <Grid Grid.Column="0" RowDefinitions="Auto, *">
+                <StackPanel Grid.Row="0" Orientation="Horizontal" Spacing="10" Margin="0,0,0,5">
+                    <TextBox Text="{Binding CurrentRoom}" Watermark="Nom du salon" Width="200" VerticalAlignment="Center"/>
+                    <Button Content="Rejoindre Salon (Join)" Command="{Binding JoinRoomCommand}"/>
+                </StackPanel>
 
-        <ListBox
-          Grid.Row="1"
-          BorderBrush="#E0E0E0"
-          BorderThickness="1"
-          ItemsSource="{Binding FocusedMessages}">
-          <ListBox.ItemTemplate>
-            <DataTemplate>
-              <TextBlock Text="{Binding}" TextWrapping="Wrap" />
-            </DataTemplate>
-          </ListBox.ItemTemplate>
-        </ListBox>
-      </Grid>
+                <ListBox Grid.Row="1" ItemsSource="{Binding Messages}"  BorderBrush="#E0E0E0" BorderThickness="1">
+                    <ListBox.ItemTemplate>
+                        <DataTemplate>
+                            <TextBlock Text="{Binding}" TextWrapping="Wrap"/>
+                        </DataTemplate>
+                    </ListBox.ItemTemplate>
+                </ListBox>
+            </Grid>
 
-      <!--  Liste des utilisateurs présents (MàJ via l'événement 'joint')  -->
-      <Border
-        Grid.Column="1"
-        Margin="10,0,0,0"
-        BorderBrush="#E0E0E0"
-        BorderThickness="1">
-        <Grid RowDefinitions="Auto, *">
-          <TextBlock
-            Grid.Row="0"
-            Margin="5"
-            HorizontalAlignment="Center"
-            FontWeight="Bold"
-            Text="Membres Présents" />
-          <ListBox
-            Grid.Row="1"
-            BorderThickness="0"
-            ItemsSource="{Binding FocusedUsers}" />
+            <!-- Liste des utilisateurs présents (MàJ via l'événement 'joint') -->
+            <Border Grid.Column="1" Margin="10,0,0,0" BorderBrush="#E0E0E0" BorderThickness="1" >
+                <Grid RowDefinitions="Auto, *">
+                    <TextBlock Grid.Row="0" Text="Membres Présents" FontWeight="Bold" Margin="5" HorizontalAlignment="Center"/>
+                    <ListBox Grid.Row="1" ItemsSource="{Binding ConnectedUsers}" BorderThickness="0"/>
+                </Grid>
+            </Border>
         </Grid>
-      </Border>
-    </Grid>
-    <!--  Saisie et envoi d'un message dans le salon joint  -->
-    <Grid
-      Grid.Row="2"
-      Margin="0,0,0,10"
-      ColumnDefinitions="*, Auto">
-      <TextBox
-        Grid.Column="0"
-        VerticalAlignment="Center"
-        AcceptsReturn="False"
-        IsEnabled="{Binding !!SelectedRoom}"
-        PlaceholderText="Votre message..."
-        Text="{Binding MessageToSend}">
-        <TextBox.KeyBindings>
-          <KeyBinding Command="{Binding SendMessageCommand}" Gesture="Enter" />
-        </TextBox.KeyBindings>
-      </TextBox>
-      <Button
-        Grid.Column="1"
-        Margin="10,0,0,0"
-        VerticalAlignment="Center"
-        Command="{Binding SendMessageCommand}"
-        Content="Envoyer" />
-    </Grid>
+        <postitControls:StatusBar Grid.Row="4" DataContext="{Binding Status}" x:Name="StatusBar" />
 
-    <postitControls:StatusBar
-      x:Name="StatusBar"
-      Grid.Row="3"
-      DataContext="{Binding Status}" />
-
-  </Grid>
+    </Grid>
 </ContentPage>
diff --git a/src/PostIt/PostIt/Views/Chat/ChatPage.axaml.cs b/src/PostIt/PostIt/Views/Chat/ChatPage.axaml.cs
index f73e1f827..5be61b86c 100644
--- a/src/PostIt/PostIt/Views/Chat/ChatPage.axaml.cs
+++ b/src/PostIt/PostIt/Views/Chat/ChatPage.axaml.cs
@@ -7,5 +7,4 @@ public partial class ChatPage : ContentPage
     {
         InitializeComponent();
     }
-
 }
diff --git a/src/PostIt/PostIt/Views/Layout/MainView.axaml b/src/PostIt/PostIt/Views/Layout/MainView.axaml
index 94b1d98bc..92f53eb54 100644
--- a/src/PostIt/PostIt/Views/Layout/MainView.axaml
+++ b/src/PostIt/PostIt/Views/Layout/MainView.axaml
@@ -16,7 +16,6 @@
   <DockPanel LastChildFill="True">
     <views:SessionStatusBanner
       x:Name="SessionBanner"
-      DataContext="{Binding SessionStatus}"
       DockPanel.Dock="Bottom"/>
     <NavigationPage x:Name="NavRoot"/>
   </DockPanel>
diff --git a/src/PostIt/PostIt/Views/Layout/SettingsPage.axaml.cs b/src/PostIt/PostIt/Views/Layout/SettingsPage.axaml.cs
index 9df94960d..b50245919 100644
--- a/src/PostIt/PostIt/Views/Layout/SettingsPage.axaml.cs
+++ b/src/PostIt/PostIt/Views/Layout/SettingsPage.axaml.cs
@@ -8,7 +8,6 @@ using System.Threading.Tasks;
 using Avalonia.Controls;
 using Avalonia.Platform.Storage;
 using Microsoft.Extensions.DependencyInjection;
-using PostIt.Models;
 using PostIt.Services;
 using PostIt.ViewModels;
 
diff --git a/src/Yavsc.Abstract/Chat/ChatHubConstants.cs b/src/Yavsc.Abstract/Chat/ChatHubConstants.cs
index e51e77e63..c673e6fae 100644
--- a/src/Yavsc.Abstract/Chat/ChatHubConstants.cs
+++ b/src/Yavsc.Abstract/Chat/ChatHubConstants.cs
@@ -4,8 +4,10 @@ namespace Yavsc.Abstract.Chat
 {
     public static class ChatHubConstants
     {
+        public const string HubGroupAuthenticated = "authenticated";
+        public const string HubGroupAnonymous = "anonymous";
         public const string HubGroupCops= "cops";
-        public const string HubGroupRoomsPrefix = "room_";
+        public const string HubGroupRomsPrefix = "room_";
         public const int MaxChanelName = 255;
 
         public const string HubGroupFollowingPrefix = "fol ";
@@ -19,6 +21,6 @@ namespace Yavsc.Abstract.Chat
         public const string HopWontKickOp  = "Half operator cannot kick any operator";
         public const string LabAuthChatUser  = "Authenticated chat user";
         public const string NoKickOnCop  = "No, you won´t, you´ĺl never do kick a cop, it is the bad.";
-        public const string LabNoJoinNoSend = "LabNoJoinNoSend";
+        public const string LabNoJoinNoSend = "LabnoJoinNoSend";
     }
 }
diff --git a/src/Yavsc.Abstract/Constants.cs b/src/Yavsc.Abstract/Constants.cs
index ca871f9d5..a2649491c 100644
--- a/src/Yavsc.Abstract/Constants.cs
+++ b/src/Yavsc.Abstract/Constants.cs
@@ -13,7 +13,6 @@ namespace Yavsc
         public const string BlogTagPath = "blogtag";
         public const string CirclePath = "circle";
         public const string CommentsPath = "blogcomments";
-        public const string ChatHubPath = "chathub";
 
         public static readonly Scope[] SiteScopes = {
             new Scope { Id = "profile", Description = "Your profile informations" },
diff --git a/src/Yavsc.Api/Program.cs b/src/Yavsc.Api/Program.cs
index 23c0c77fd..8daff34d9 100644
--- a/src/Yavsc.Api/Program.cs
+++ b/src/Yavsc.Api/Program.cs
@@ -11,7 +11,6 @@ using Yavsc.Models;
 using Yavsc;
 using Yavsc.Server.Helpers;
 using Yavsc.Services;
-using Yavsc.Server.Hubs;
 
 internal class Program
 {
@@ -66,12 +65,7 @@ internal class Program
         services.AddAuthentication("Bearer")
                  .AddYavscJwtBearer(builder.Configuration);
 
-        services.AddSignalR()
-            // ChatRoomInfo et d'autres DTO de hub exposent des champs
-            // publics (pas des propriétés) : STJ ne les sérialise pas
-            // sans IncludeFields, et le client recevrait des objets vides.
-            .AddJsonProtocol(options =>
-                options.PayloadSerializerOptions.IncludeFields = true);
+        services.AddSignalR();
         services.AddSingleton<IConnexionManager, HubConnectionManager>();
 
         // DbContextBuilder
@@ -120,11 +114,13 @@ internal class Program
                 .UseRouting()
                 .UseAuthentication()
                 .UseAuthorization()
-                .UseCors("default");
+                .UseCors("default")
+                ;
             app.MapIdentityApi<ApplicationUser>().RequireAuthorization("ApiScope");
             app.MapDefaultControllerRoute();
+
+
             app.UseSession();
-            app.MapHub<ChatHub>("/" + Constants.ChatHubPath);
             await app.RunAsync();
         }
     }
diff --git a/src/Yavsc.Org/Controllers/Accounting/ManageController.cs b/src/Yavsc.Org/Controllers/Accounting/ManageController.cs
index 32357c2c5..e09bbb5a4 100644
--- a/src/Yavsc.Org/Controllers/Accounting/ManageController.cs
+++ b/src/Yavsc.Org/Controllers/Accounting/ManageController.cs
@@ -400,7 +400,7 @@ namespace Yavsc.Controllers
 
         public IActionResult SetUserName()
         {
-            return View(new SetUserNameViewModel() { UserName = User.GetUserName() });
+            return View(new SetUserNameViewModel() { UserName = User.Identity.Name });
         }
 
         [HttpPost]
diff --git a/src/Yavsc.Org/Extensions/HostingExtensions.cs b/src/Yavsc.Org/Extensions/HostingExtensions.cs
index 563a74789..b5bb65cc5 100644
--- a/src/Yavsc.Org/Extensions/HostingExtensions.cs
+++ b/src/Yavsc.Org/Extensions/HostingExtensions.cs
@@ -1053,6 +1053,8 @@ public static class HostingExtensions
         app.UseCors("default");
         app.MapDefaultControllerRoute();
         app.MapStaticAssets(staticAssetsManifestPath);
+        //app.MapRazorPages();
+        app.MapHub<ChatHub>("/chatHub");
 
         WorkflowHelpers.ConfigureBillingService();
 
diff --git a/src/Yavsc.Server/Helpers/ServiceExtensions.cs b/src/Yavsc.Server/Helpers/ServiceExtensions.cs
index db5dbe983..397eada85 100644
--- a/src/Yavsc.Server/Helpers/ServiceExtensions.cs
+++ b/src/Yavsc.Server/Helpers/ServiceExtensions.cs
@@ -128,29 +128,7 @@ public static class ServiceExtensions
             options.ClaimsIssuer = authority;
             options.Audience = audiences[0];
 
-            // Sending the access token in the query string is required when using WebSockets or ServerSentEvents
-            // due to a limitation in Browser APIs. We restrict it to only calls to the
-            // SignalR hub in this code.
-            // See https://docs.microsoft.com/aspnet/core/signalr/security#access-token-logging
-            // for more information about security considerations when using
-            // the query string to transmit the access token.
-            options.Events = new JwtBearerEvents
-            {
-                OnMessageReceived = context =>
-                {
-                    var accessToken = context.Request.Query["access_token"];
 
-                    // If the request is for our hub...
-                    var path = context.HttpContext.Request.Path;
-                    if (!string.IsNullOrEmpty(accessToken) &&
-                        (path.StartsWithSegments("/hubs/chat")))
-                    {
-                        // Read the token out of the query string
-                        context.Token = accessToken;
-                    }
-                    return Task.CompletedTask;
-                }
-            };
             // Dev: every Yavsc resource service (Yavsc.Api, Yavsc.Blogs,
             // Yavsc.Org itself) validates JWTs against the OP that runs
             // on https://localhost:5001 with a self-signed dev cert.
diff --git a/src/Yavsc.Server/Hubs/ChatHub.cs b/src/Yavsc.Server/Hubs/ChatHub.cs
index b9e54496c..799f7441c 100644
--- a/src/Yavsc.Server/Hubs/ChatHub.cs
+++ b/src/Yavsc.Server/Hubs/ChatHub.cs
@@ -24,7 +24,6 @@
 using Microsoft.AspNetCore.SignalR;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Localization;
-
 #pragma warning disable CS4014 // Dans la mesure où cet appel n'est pas attendu, l'exécution de la méthode actuelle continue avant la fin de l'appel
 
 namespace Yavsc.Server.Hubs
@@ -37,8 +36,6 @@ namespace Yavsc.Server.Hubs
     using Yavsc.Models.Chat;
     using Yavsc.Server.Helpers;
     using Yavsc.Services;
-
-    [Authorize]
     public partial class ChatHub : Hub, IDisposable
     {
         private readonly ApplicationDbContext _dbContext;
@@ -56,70 +53,100 @@ namespace Yavsc.Server.Hubs
             _dbContext = dbContext;
             _localizer = stringLocalizerFactory.Create(typeof(ChatHub));
 
-            _cxManager = connexionManager;
-            _cxManager.SetErrorHandler((context, error) =>
+            _cxManager =  connexionManager;
+            _cxManager.SetErrorHandler ((context, error) =>
             {
                 NotifyUser(NotificationTypes.Error, context, error);
             });
             _logger = loggerFactory.CreateLogger<ChatHub>();
-            InputValidator = new HubInputValidator(_localizer)
-            {
+            InputValidator = new HubInputValidator(_localizer) {
 
-                NotifyUser = async (type, target, msg) => await this.NotifyUser(type, target, msg)
-            };
+                NotifyUser = async (type, target, msg) => await this.NotifyUser(type, target, msg) };
+        }
+
+        void SetUserName(string cxId, string userName)
+        {
+            _cxManager.SetUserName(cxId,  userName);
         }
 
         public override async Task OnConnectedAsync()
         {
-            var user = Context.User;
+            bool isAuth = Context.User?.Identity?.IsAuthenticated ?? false;
             bool isCop = false;
-            string userName = user.GetUserName();
-
-            _logger.LogInformation(_localizer.GetString(ChatHubConstants.LabAuthChatUser));
-
-            var userId = _dbContext.Users.First(u => u.UserName == userName).Id;
-
-            await Clients.Group(ChatHubConstants.HubGroupFollowingPrefix + userId).SendAsync("notifyUser", NotificationTypes.Connected, userName, null);
-            isCop = Context.User.IsInMsRole(Constants.AdminGroupName);
-            if (isCop)
+            string userName = setUserName();
+            if (isAuth)
             {
-                await Groups.AddToGroupAsync(Context.ConnectionId, ChatHubConstants.HubGroupCops);
-            }
 
-            foreach (var uid in _dbContext.CircleMembers.Select(m => m.MemberId))
-            {
-                await Groups.AddToGroupAsync(Context.ConnectionId, ChatHubConstants.HubGroupFollowingPrefix + uid);
+                var group = isAuth ?
+                 ChatHubConstants.HubGroupAuthenticated : ChatHubConstants.HubGroupAnonymous;
+                // Log ("Cx: " + group);
+                await Groups.AddToGroupAsync(Context.ConnectionId, group);
+                _logger.LogInformation(_localizer.GetString(ChatHubConstants.LabAuthChatUser));
+
+                var userId = _dbContext.Users.First(u => u.UserName == Context.User.Identity.Name).Id;
+
+                await Clients.Group(ChatHubConstants.HubGroupFollowingPrefix + userId).SendAsync("notifyUser",  NotificationTypes.Connected, userName, null);
+                isCop = Context.User.IsInMsRole(Constants.AdminGroupName) ;
+                if (isCop)
+                {
+                    await Groups.AddToGroupAsync(Context.ConnectionId, ChatHubConstants.HubGroupCops);
+                }
+
+                foreach (var uid in _dbContext.CircleMembers.Select(m => m.MemberId))
+                {
+                    await Groups.AddToGroupAsync(Context.ConnectionId, ChatHubConstants.HubGroupFollowingPrefix + uid);
+                }
             }
-            _cxManager.OnConnected(Context.ConnectionId, userName, isCop);
+            else
+            {
+                await Groups.AddToGroupAsync(Context.ConnectionId, ChatHubConstants.HubGroupAnonymous);
+            }
+            _cxManager.OnConnected(Context.ConnectionId, isCop);
             await base.OnConnectedAsync();
         }
 
+        string setUserName(string queryUname = "anon")
+        {
+            if (Context.User != null)
+                if (Context.User.Identity.IsAuthenticated)
+                {
+                    SetUserName(Context.ConnectionId, Context.User.Identity.Name);
+                    return Context.User.Identity.Name;
+                }
+            anonymousSequence++;
+            var anonymousName = $"{ChatHubConstants.AnonymousUserNamePrefix}{queryUname}{anonymousSequence}";
+            SetUserName(Context.ConnectionId, anonymousName);
+            return anonymousName;
+        }
+
+        static long anonymousSequence = 0;
+
         public override async Task OnDisconnectedAsync(Exception ex)
         {
-            string userName = Context.User?.GetUserName();
+            string userName = Context.User?.Identity.Name;
             if (userName != null)
             {
                 var user = _dbContext.Users.FirstOrDefault(u => u.UserName == userName);
-                if (user != null)
-                {
-                    var userId = user.Id;
-                    await Clients.Group(ChatHubConstants.HubGroupFollowingPrefix + userId).SendAsync("notifyUser", NotificationTypes.DisConnected, userName, null);
-                }
+                var userId = user.Id;
+                await Clients.Group(ChatHubConstants.HubGroupFollowingPrefix + userId).SendAsync("notifyUser", NotificationTypes.DisConnected, userName, null);
 
                 _cxManager.OnDisconnected(Context.ConnectionId);
             }
-            await base.OnDisconnectedAsync(ex);
+              await base.OnDisconnectedAsync(ex);
         }
 
-        /// <summary>
-        /// Renvoie le login résolu côté serveur (claim <c>name</c> de
-        /// l'organisation Yavsc.Org, via <see cref="UserHelpers.GetUserName"/>).
-        /// Permet au client d'afficher l'identité réellement authentifiée,
-        /// sans jamais faire confiance à un pseudo fourni par le client.
-        /// </summary>
-        public string WhoAmI()
+
+        public async Task Nick(string nickName)
         {
-            return Context.User?.GetUserName() ?? string.Empty;
+            if (!InputValidator.ValidateUserName(nickName)) return;
+
+            var candidate = "?" + nickName;
+            if (_cxManager.IsConnected(candidate))
+            {
+                await NotifyUser(NotificationTypes.ExistingUserName, nickName, "aborting");
+                return;
+            }
+            _cxManager.SetUserName( Context.ConnectionId,  candidate);
         }
 
         bool IsPresent(string roomName, string userName)
@@ -132,11 +159,11 @@ namespace Yavsc.Server.Hubs
             _logger.LogInformation($"Join:{roomName}");
             if (!InputValidator.ValidateRoomName(roomName))
             {
-                _logger.LogError("!InputValidator.ValidateRoomName(roomName)");
+               _logger.LogError("!InputValidator.ValidateRoomName(roomName)");
                 return null;
             }
 
-            var roomGroupName = ChatHubConstants.HubGroupRoomsPrefix + roomName;
+            var roomGroupName = ChatHubConstants.HubGroupRomsPrefix + roomName;
             var user = _cxManager.GetUserName(Context.ConnectionId);
             await Groups.AddToGroupAsync(Context.ConnectionId, roomGroupName);
             ChatRoomInfo channelInfo;
@@ -145,18 +172,12 @@ namespace Yavsc.Server.Hubs
                 _logger.LogInformation($"Joining");
                 channelInfo = _cxManager.Join(roomName, Context.ConnectionId);
                 await Clients.Group(roomGroupName).SendAsync("notifyRoom", NotificationTypes.UserJoin, roomName, user);
-            }
-            else
-            {
+            } else {
                 _logger.LogInformation($"already present");
                 // in case in an additional connection,
                 // one only send info on room without
                 // warning any other user.
-                if (!_cxManager.TryGetChanInfo(roomName, out channelInfo))
-                {
-                    _logger.LogError($"Failed to retrieve channel info for room: {roomName}");
-                    return null;
-                }
+                _cxManager.TryGetChanInfo(roomName, out channelInfo);
             }
 
             _logger.LogInformation($"returning channel info");
@@ -164,13 +185,14 @@ namespace Yavsc.Server.Hubs
             return channelInfo;
         }
 
+        [Authorize]
         public void Register(string room)
         {
-            if (!InputValidator.ValidateRoomName(room)) return;
+            if (!InputValidator.ValidateRoomName(room)) return ;
             var existent = _dbContext.ChatRoom.Any(r => r.Name == room);
             if (existent)
             {
-                NotifyUserInRoom(NotificationTypes.Error, room, "already registered.");
+               NotifyUserInRoom(NotificationTypes.Error, room, "already registered.");
                 return;
             }
             Debug.Assert(Context.User != null);
@@ -190,25 +212,27 @@ namespace Yavsc.Server.Hubs
             _dbContext.SaveChanges(user.Id);
         }
 
-        public void KickBan(string roomName, string userName, string reason)
+        [Authorize]
+        public void KickBan(string roomName,  string userName, string reason)
         {
-            if (!InputValidator.ValidateRoomName(roomName)) return;
-            if (!InputValidator.ValidateUserName(userName)) return;
+            if (!InputValidator.ValidateRoomName(roomName)) return ;
+            if (!InputValidator.ValidateUserName(userName)) return ;
             if (!InputValidator.ValidateReason(reason)) return;
             Kick(roomName, userName, reason);
             Ban(roomName, userName, reason);
         }
 
-        public async Task Kick(string roomName, string userName, string reason)
+        [Authorize]
+        public async Task Kick(string roomName,  string userName,  string reason)
         {
-            if (!InputValidator.ValidateRoomName(roomName)) return;
-            if (!InputValidator.ValidateUserName(userName)) return;
+            if (!InputValidator.ValidateRoomName(roomName)) return ;
+            if (!InputValidator.ValidateUserName(userName)) return ;
             if (!InputValidator.ValidateReason(reason)) return;
             ChatRoomInfo channelInfo;
-            var roomGroupName = ChatHubConstants.HubGroupRoomsPrefix + roomName;
+            var roomGroupName = ChatHubConstants.HubGroupRomsPrefix + roomName;
             if (_cxManager.TryGetChanInfo(roomName, out channelInfo))
             {
-                if (!_cxManager.IsPresent(roomName, userName))
+                if (!_cxManager.IsPresent(roomName,userName))
                 {
                     NotifyErrorToCallerInRoom(roomName, $"{userName} was not found in {roomName}.");
                     return;
@@ -218,44 +242,44 @@ namespace Yavsc.Server.Hubs
                 if (!_cxManager.Kick(Context.ConnectionId, userName, roomName, reason)) return;
             }
             var cxIds = _cxManager.GetConnexionIds(userName);
-            if (cxIds != null) foreach (var cx in cxIds)
+            if (cxIds!=null) foreach(var cx in cxIds)
                 await Groups.RemoveFromGroupAsync(cx, roomGroupName);
             await Clients.Group(roomGroupName).SendAsync("notifyRoom", NotificationTypes.Kick, roomName, $"{userName}: {reason}");
         }
 
-        public void Ban(string roomName, string userName, string reason)
+        [Authorize]
+        public void Ban(string roomName,  string userName,  string reason)
         {
-            if (!InputValidator.ValidateRoomName(roomName)) return;
-            if (!InputValidator.ValidateUserName(userName)) return;
+            if (!InputValidator.ValidateRoomName(roomName)) return ;
+            if (!InputValidator.ValidateUserName(userName)) return ;
             if (!InputValidator.ValidateReason(reason)) return;
             var cxIds = _cxManager.GetConnexionIds(userName);
             throw new NotImplementedException();
         }
 
-        [Authorize(Constants.AdminGroupName)]
-        public void GLine(string userName, string reason)
+        [Authorize]
+        public void GLine(string userName,  string reason)
         {
-            if (!InputValidator.ValidateUserName(userName)) return;
+            if (!InputValidator.ValidateUserName(userName)) return ;
             if (!InputValidator.ValidateReason(reason)) return;
             throw new NotImplementedException();
         }
 
-        public void Part(string roomName, string reason)
+        public void Part(string roomName,  string reason)
         {
-            if (!InputValidator.ValidateRoomName(roomName)) return;
+            if (!InputValidator.ValidateRoomName(roomName)) return ;
             if (!InputValidator.ValidateReason(reason)) return;
-            if (_cxManager.Part(Context.ConnectionId, roomName, reason))
-            {
-                var roomGroupName = ChatHubConstants.HubGroupRoomsPrefix + roomName;
+            if (_cxManager.Part(Context.ConnectionId,  roomName,   reason))
+             {
+                var roomGroupName = ChatHubConstants.HubGroupRomsPrefix + roomName;
                 var group = Clients.Group(roomGroupName);
                 var userName = _cxManager.GetUserName(Context.ConnectionId);
                 group.SendAsync("notifyRoom", NotificationTypes.UserPart, roomName, $"{userName}: {reason}");
                 Groups.RemoveFromGroupAsync(Context.ConnectionId, roomGroupName);
-            }
-            else
-            {
-                _logger.LogError("Could not part");
-            }
+             }
+             else {
+                 _logger.LogError("Could not part");
+             }
         }
 
         void NotifyErrorToCallerInRoom(string room, string reason)
@@ -264,21 +288,19 @@ namespace Yavsc.Server.Hubs
             _logger.LogError($"NotifyErrorToCallerInRoom: {room}, {reason}");
         }
 
-        public async Task Send(string roomName, string message)
+        public async Task Send(string roomName,  string message)
         {
             _logger.LogInformation($"Send {roomName} {message}");
-            if (!InputValidator.ValidateRoomName(roomName))
-            {
+            if (!InputValidator.ValidateRoomName(roomName))  {
                 _logger.LogError($"Invalid roomName : {roomName}");
-                return;
+                return ;
             }
-            if (!InputValidator.ValidateMessage(message))
-            {
+            if (!InputValidator.ValidateMessage(message))  {
                 _logger.LogError($"Invalid message : {message}");
-                return;
+                return ;
             }
-            var groupName = ChatHubConstants.HubGroupRoomsPrefix + roomName;
-            ChatRoomInfo channelInfo;
+            var groupName = ChatHubConstants.HubGroupRomsPrefix + roomName;
+            ChatRoomInfo channelInfo ;
             if (!_cxManager.TryGetChanInfo(roomName, out channelInfo))
             {
                 _logger.LogError($"No such room : {roomName}");
@@ -295,7 +317,7 @@ namespace Yavsc.Server.Hubs
                 return;
             }
             var group = Clients.Group(groupName);
-            var msg = new { Name = userName, Room = roomName, Message = message };
+            var msg = new { Name = userName, Room = roomName, Message = message};
             await group.SendAsync("ReceiveMessage", msg);
         }
 
@@ -310,7 +332,8 @@ namespace Yavsc.Server.Hubs
             await Clients.Caller.SendAsync("notifyUserInRoom", type, room, message);
         }
 
-        public async Task SendPV(string userName, string message)
+        [Authorize]
+        public async Task SendPV(string userName,  string message)
         {
             // Authorized code
             Debug.Assert(Context.User != null);
@@ -319,17 +342,17 @@ namespace Yavsc.Server.Hubs
             if (!InputValidator.ValidateUserName(userName))
             {
                 _logger.LogError($"Invalid username : {userName}");
-                return;
+                return ;
             }
             if (!InputValidator.ValidateMessage(message))
             {
                 _logger.LogError($"Invalid message : {message}");
-                return;
+                return ;
             }
             _logger.LogInformation($"Message form is validated.");
-            var identityUserName = Context.User.GetUserName();
+                    var identityUserName = Context.User.GetUserName();
 
-            if (userName[0] != '?' && Context.User != null)
+            if (userName[0] != '?' && Context.User!=null)
                 if (!Context.User.IsInMsRole(Constants.AdminGroupName))
                 {
 
@@ -350,7 +373,7 @@ namespace Yavsc.Server.Hubs
 
             _logger.LogInformation("getting cx id´s");
             var cxIds = _cxManager.GetConnexionIds(userName);
-            if (cxIds == null || cxIds.Count() == 0)
+            if (cxIds==null || cxIds.Count()==0)
                 _logger.LogError($"No such connected user : {userName}");
             else foreach (var connectionId in cxIds)
             {
@@ -362,18 +385,18 @@ namespace Yavsc.Server.Hubs
             }
         }
 
-        public async Task SendStream(string connectionId, long streamId, string message)
+        [Authorize]
+        public async Task SendStream(string connectionId, long streamId,  string message)
         {
             // Authorized code
             Debug.Assert(Context.User != null);
             Debug.Assert(Context.User.Identity != null);
             if (!InputValidator.ValidateMessage(message)) return;
-            var sender = Context.User.GetUserName();
+            var sender = Context.User.Identity.Name;
             var cli = Clients.Client(connectionId);
             await cli.SendAsync("addStreamInfo", sender, streamId, message);
         }
 
     }
 }
-
-#pragma warning restore CS4014
+#pragma warning restore CS4014 // Dans la mesure où cet appel n'est pas attendu, l'exécution de la méthode actuelle continue avant la fin de l'appel
diff --git a/src/Yavsc.Server/Interfaces/IConnexionManager.cs b/src/Yavsc.Server/Interfaces/IConnexionManager.cs
index 4e13a50a5..434054249 100644
--- a/src/Yavsc.Server/Interfaces/IConnexionManager.cs
+++ b/src/Yavsc.Server/Interfaces/IConnexionManager.cs
@@ -3,8 +3,10 @@ using Yavsc.ViewModels.Chat;
 namespace Yavsc.Services
 {
     public interface IConnexionManager {
+        void SetUserName(string cxId, string userName);
+
         string GetUserName (string cxId);
-        void OnConnected(string cxId, string userName, bool isCop);
+        void OnConnected(string cxId, bool isCop);
         bool IsConnected(string candidate);
 
         void OnDisconnected (string cxId);
diff --git a/src/Yavsc.Server/Services/HubConnectionManager.cs b/src/Yavsc.Server/Services/HubConnectionManager.cs
index 98d57085e..05ed49dda 100644
--- a/src/Yavsc.Server/Services/HubConnectionManager.cs
+++ b/src/Yavsc.Server/Services/HubConnectionManager.cs
@@ -53,15 +53,30 @@ namespace Yavsc.Services
             _localizer = stringLocFactory.Create(typeof(HubConnectionManager));
         }
 
-        public void OnConnected(string cxId, string userName, bool isCop)
+        public void SetUserName(string cxId, string userName)
         {
+            string oldUname;
+            if (ChatUserNames.TryGetValue(cxId, out oldUname))
+            {
+                // this is a rename
+                if (oldUname == userName) return;
+                ChatCxIds[userName] = ChatCxIds[oldUname];
+                ChatCxIds[oldUname] = null;
+            }
+            else
+            {
+                // this is a connexion
+                ChatCxIds[userName] = new List<string>() { cxId };
+            }
             ChatUserNames[cxId] = userName;
-            ChatCxIds.AddOrUpdate(userName,
-                _ => new List<string> { cxId },
-                (_, list) => { lock (list) { if (!list.Contains(cxId)) list.Add(cxId); } return list; });
-            if (!IsConnected(userName))
-                ChatRoomPresence[userName] = new List<string>();
-            _isCop[userName] = isCop;
+        }
+        // Username must have been set before calling this method.
+        public void OnConnected(string cxId,  bool isCop)
+        {
+            var username = ChatUserNames[cxId];
+            if (!IsConnected(username))
+                ChatRoomPresence[username] = new List<string>();
+            _isCop[username] = isCop;
         }
 
         public bool IsConnected(string candidate)