WebSocket error on production server

There are two kinds of errors, which I get with my online meteor application:

WebSocket connection to 'ws://domain.com/sockjs/995/_fadmh0z/websocket' failed: WebSocket is closed before the connection is established.
WebSocket connection to 'ws://domain.com/sockjs/792/cmsop6nh/websocket' failed: Error during WebSocket handshake: Unexpected response code: 400

On my localhost, there isn’t any problem. Any idea what’s going wrong with that?

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+1, same problem on production