我已成功安装并配置AppRTC, Collider, turn-server。但我面临一个Websocket错误问题。谷歌浏览器控制台报错如下：
Initializing; server= undefined.
apprtc.debug.js:5583 1.413: Initializing; room=undefined.
apprtc.debug.js:5583 5.209: Opening signaling channel.
apprtc.debug.js:5583 5.390: Got access to local media with mediaConstraints:
'{"audio":true,"video":{"optional":[{"minWidth":"1280"},{"minHeight":"720"}],"mandatory":{}}}'
apprtc.debug.js:5583 5.390: User has granted access to local media.
apprtc.debug.js:5583 5.391: Attaching local stream.
apprtc.debug.js:5092 WebSocket connection to 'wss://104.198.4.111:8089/ws' failed: Error in connection establishment: net::ERR_CONNECTION_REFUSED
(anonymous) @ apprtc.debug.js:5092
apprtc.debug.js:5583 5.578: WebSocket open error: WebSocket error.
apprtc.debug.js:5583 5.584: WebSocket register error: WebSocket error.
apprtc.debug.js:5583 5.636: Joined the room.
以下是我面临的 WebSocket 错误的屏幕截图
Collider并且AppRTC在 Google VM 实例上，我使用了我自己的已在AWS EC2实例上设置的转向服务器。请帮我解决这个问题。Google APP engine我部署APP的地方有什么设置吗？
高级帮助将不胜感激！