Hi and welcome!
I think the websockify is a red herring for this use case. It’s not invoked. What’s happening is we’re creating a websocket to the server and the server is opening an ssh session to the other login.
Here’s the flow to help us debug a bit.
you —(web socket)—> open ondemand —(ssh)—> the login node
I’m kind of surprised there’s nothing in /var/log/ondemand-nginx/$USER/error.log but there could be something on the client side. Open up the developer tools in your browser and see the network and console tabs. Maybe there’s something there?
Also just as a sanity check, be sure that you can ssh from the open ondemand webnode to the destination login manually.