Server closes connections gracefully so kick/ban/reset/shutdown messages arrive; status dot and HUD yellow until really connected (also while reconnecting)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

GameServer.cs

@@ -79,7 +79,7 @@ public sealed class GameServer
 
     public void EnqueueCommand(string line) => commands.Enqueue(line);
 
-    int JoinedCount => clients.Values.Count(c => c.State == ClientState.Joined);
+    int JoinedCount => clients.Values.Count(c => c.State == ClientState.Joined && !c.Conn.IsClosing); // gerade getrennte zählen nicht mehr
 
     // ---------------------------------------------------------------- Start / Schleife
 
@@ -142,8 +142,16 @@ public sealed class GameServer
         {
             // Grund mitschicken: die Spieler sehen ihn im Hauptmenü
             if (c.State == ClientState.Joined) c.Conn.Send(MsgType.Reject, Wire.Build(w => w.Write("The server was shut down.")));
-            c.Conn.Close("Server shutting down");
+            c.Conn.CloseAfterSend("Server shutting down");
         }
+        // Kurz warten, bis die Spieler die Meldung gelesen haben (sauber trennen statt hart abbrechen)
+        var waitUntil = DateTime.UtcNow.AddSeconds(1.5);
+        while (DateTime.UtcNow < waitUntil && clients.Values.Any(c => !c.Conn.IsClosed))
+        {
+            foreach (var c in clients.Values) c.Conn.Poll();
+            Thread.Sleep(20);
+        }
+        foreach (var c in clients.Values) c.Conn.Close("Server shutting down");
         listener.Stop();
         SaveWorld();
         if (!offline)
@@ -272,7 +280,7 @@ public sealed class GameServer
                     w.Write(names.Count);
                     foreach (string n in names) w.Write(n);
                 }));
-                c.Conn.Close("Info query");
+                c.Conn.CloseAfterSend("Info query");
                 return;
 
             case MsgType.Hello:
@@ -404,8 +412,8 @@ public sealed class GameServer
         c.SteamVerified = steam.Enabled && !c.SteamId.StartsWith("name:");
         foreach (var other in clients.Values)
         {
-            if (other == c || other.State != ClientState.Joined || other.SteamId != c.SteamId) continue;
-            if (c.SteamVerified) other.Conn.Close("Joined from another location"); // echter Account: alte Verbindung trennen
+            if (other == c || other.State != ClientState.Joined || other.Conn.IsClosing || other.SteamId != c.SteamId) continue;
+            if (c.SteamVerified) other.Conn.CloseAfterSend("Joined from another location"); // echter Account: alte Verbindung trennen
             else { Reject(c, "A player with this identity is already connected"); return; }
         }
 
@@ -440,7 +448,7 @@ public sealed class GameServer
     void Reject(Client c, string reason)
     {
         c.Conn.Send(MsgType.Reject, Wire.Build(w => w.Write(reason)));
-        c.Conn.Close(reason);
+        c.Conn.CloseAfterSend(reason);
         Log($"Rejected {c.Name} ({c.Conn.RemoteAddress}): {reason}");
     }
 
@@ -472,7 +480,7 @@ public sealed class GameServer
         foreach (var c in clients.Values.Where(x => x.State == ClientState.Joined).ToList())
         {
             c.Conn.Send(MsgType.Reconnect, Wire.Build(w => w.Write(message)));
-            c.Conn.Close("Reconnect after world change");
+            c.Conn.CloseAfterSend("Reconnect after world change");
             count++;
         }
         if (count > 0) Log($"{count} player(s) will reconnect");