almost 2 years ago - Bucky - Direct link
Originally posted by SoldierOfChr1st: this has not worked since game became available. use hamachi, or some sort of vpn to connect together. Still might be best to wait til seamless map update prior to getting really into this game.

Multiplayer through Steam has been working for a very long time now.
If you are having connectivity issues through Steam then it's likely your ports are restricted or closed.