To be able to play in LAN mode, you might need to port forward connections to certain ports in your network, this will ensure your friend or family member can connect to your game and vice-verse.
Torchlight II Network Port Requirements[]
The following ports are required for Torchlight II multi-player:
- TCP: 4549
- UDP: 4175, 4179, 4171
- UDP: 4549 (on the Linux GoG.com version)
Tips[]
Don't connect one computer to several ports, one might think that "more" is "more", but in this case, "less" is "more". It's like sending a current through two paths rather that one, which will make things less confusing for the computers.
Four ports can ensure 4 computers may be able to play in the same network without major issues.
Antivirus software and Firewall can also play a part in multiplayer LAN connection issues. Try to add Torchlight to the list of exceptions, or even activating "game mode" or "silent mode" in the settings of your antivirus or firewall.