diff --git a/packages/backend/server/src/base/websocket/config.ts b/packages/backend/server/src/base/websocket/config.ts
index d60872fc86..9732f4c435 100644
--- a/packages/backend/server/src/base/websocket/config.ts
+++ b/packages/backend/server/src/base/websocket/config.ts
@@ -14,7 +14,7 @@ declare module '../config' {
 }
 
 defineStartupConfig('websocket', {
+  transports: ['websocket', 'polling'],
   // see: https://socket.io/docs/v4/server-options/#maxhttpbuffersize
-  transports: ['websocket'],
   maxHttpBufferSize: 1e8, // 100 MB
 });
diff --git a/packages/common/nbstore/src/impls/cloud/socket.ts b/packages/common/nbstore/src/impls/cloud/socket.ts
index 683bb486b0..b60a595c61 100644
--- a/packages/common/nbstore/src/impls/cloud/socket.ts
+++ b/packages/common/nbstore/src/impls/cloud/socket.ts
@@ -158,7 +158,7 @@ class SocketManager {
   constructor(endpoint: string) {
     this.socketIOManager = new SocketIOManager(endpoint, {
       autoConnect: false,
-      transports: ['websocket'],
+      transports: [BUILD_CONFIG.isIOS ? 'polling' : 'websocket'],
       secure: new URL(endpoint).protocol === 'https:',
       // we will handle reconnection by ourselves
       reconnection: false,