Change clients websocket port

A client has port 80 blocked for websockets, this is her websocket test result:

Is there a way to fix this? Can I change the client-side port that websocket will connect through?

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I also need help in this area. I am having problems with a Meteor app and I think it is because Vodafone (a mobile network operator) is blocking websocket connections to port 80.

Is it possible to change the DDP port? Does anyone have a workaround to make Meteor work?

Thank you very much for your help and time!