Websocket client outside localhost

Are the rules explained in WatsonWebsocket necessary also for WebSocketClient ? I really do not seem to be able to connect to a funcitonal server to which I can connect correctly with Postman from the same machine.

It started to work when I typed the port in the “Server” input (Listener IP iobox), instead of the “Port” input so I guess this should be moved to the bug category if this is not related to the WatsonWebsocket library.

EDIT: my bad I had an IOBOX named “Port” connected to the wrong input