diff --git a/src/lib/online/signalr-service.ts b/src/lib/online/signalr-service.ts
index 88c78cb..2b06e55 100644
--- a/src/lib/online/signalr-service.ts
+++ b/src/lib/online/signalr-service.ts
@@ -141,10 +141,15 @@ export class SignalrService implements OnlineService {
   private async connect(): Promise<void> {
     if (this.conn || !this.token) return;
     const conn = new signalR.HubConnectionBuilder()
-      // Normal negotiate flow → auto-picks the best transport (WS, else SSE /
-      // long-poll). Requires api.bargevasat.ir to BYPASS the CDN (WCDN 404s the
-      // negotiate POST); with the CDN bypassed this is the most robust path.
-      .withUrl(`${SERVER}/hub/game`, { accessTokenFactory: () => this.token ?? "" })
+      // Force Long-Polling: plain HTTP POST/GET that works through the existing
+      // nginx/CDN (same path REST already uses) without needing WebSocket-upgrade
+      // headers. SignalR holds the poll open, so for a turn-based game it's
+      // effectively real-time. Switch back to default transports once the api
+      // server block proxies WS upgrades.
+      .withUrl(`${SERVER}/hub/game`, {
+        accessTokenFactory: () => this.token ?? "",
+        transport: signalR.HttpTransportType.LongPolling,
+      })
       .withAutomaticReconnect()
       .configureLogging(signalR.LogLevel.Warning)
       .build();