Borderlands has received a small update on the PC to fix a big annoyance.
Multiplayer connectivity has been improved; users should no longer be required to forward ports to host or join multiplayer games
If there's one gripe I always had with PC games, its when they require you to make changes to your firewall just to play multiplayer, so good news indeed. The patch also fixed a small graphic glitch and updated the crosshair on 3d displays.
Wait...Moxxi in 3d!?!? I'll be back later.
Source: Gearboxsoftware.com