Proxy Settings

Hello there,
my company is behind a Firewall and using a Proxy.
We’re currently having trouble with the official Plattform.
Since the Browser Console is saying, that there are Websocket Connection Errors, I’m guessing that the Proxy Settings we did earlier this year are in some form outdated.
Is there somewhere official up-to-date information on this topic?

Also for clarification, we can’t open UDP Ports, for security reasons.

kind regards,