So i have read a lot of posts and topics regarding issues with Lan-Play though my actual issue wasn’t mentioned:
When i try to set up lan gameplay (GOG Version) i forwarded the following ports:
TCP: 27015-27016, 27031-27036, 42805, 42852-42872
UDP: 27015-27016, 27031-27036, 42805, 42852-42872
After doing so the HOST is seen on the Lan-Tab in the game. BUT ONLY if the Client disables its firewall completly. If i switch Host and Client the issue remains so it doesn’t seem to be related to the computer itself but rather some client setting or Port that wasn’t set? Though i don’t get it why is it working to host a game with only forwarding these ports while the client has shut down its firewall completly? Is there some port I’m missing? What’s the issue?
I now have investigated this for way to long. And the reason for this seems that Grim Dawn needs ports for the client that aren’t mentioned anywhere. When i disable my firewall i saw that the client opens Port 42804 this port isn’t mentioned anywhere. Yet it seems to be needed to be able to see the server.
I don’t know how Grim Dawn is setting the ports. Though i will explain what i actually did to track this down:
First i disabled the Firewall on my Client Computer
Then i started grim dawn and went to the In-Game Lan-Browser/Tab. There i hammered “refresh” a few times.
Then i went to the command line and checked netstat -tunlp.
There i would now see that Grim Dawn.exe now uses the Port 42804. So i once again started my firewall and also opened that port. After doing so i was still able to see the server - without shutting down my firewall. Now i don’t know if grim dawn(client) is setting these ports dynamically, if this is a “fixed” port or if it sets a port within a range. So it is perfectly possible that the next time i start grim dawn it would use another port. But so far it was enough to allow 42804 to be able to see the server and being able to join.
(or if Zantai has already seen it)