Multiplayer: not functional at all

Since purchase last month I have been unable to join or host a multiplayer game. Absolutely no functionality.

I have updated to the most current patch.

Anytime I click join game nothing happens.

When I try to create a game, one with no password, it tells me password invalid and fails.

When I try to create a game with a password it says the same and fails.

pc specs?
latest drivers?
network setup?

Tech support.

@Psychichazard. Care to move this for him?