Hello!

I hope this is the right forum to ask.
I've been trying to play Jazz2 CO-OP on GOG Galaxy with a friend.

Problem is I can create the server but my friend can't join. the server name is listed but it says "pinging" next to it and won't let him connect. He tired to host it instead but the same problem.
There's a prompt at the bottom to write an address. We tried our IP addresses but that only created another server with that address as the name ans still stuck "pinging".

I've tried to find a solution but no luck. The GOG forums are very sparse on Jazz2 info so I thought I'd have better luck here.

What am I doing wrong?