I have Parse Server running on Ubuntu 14.04.4, i am using liveQuery from Parse and it's using websocket, when i run my application on localhost it's working fine but when i am using the application on digitalocean i got this error:

WebSocket connection to 'ws://xxx.xxxx.com/api' failed: Error during WebSocket handshake: Unexpected response code: 403

i am sure my code it's working fine, is there any configuration or setup should i use to make it running?

Thanks