For people still wondering I fixed it by instaling T4M on his PC i do not know how that conflicts but oh well

The only thing I can think of currently is that you guys don't have the same version of the game.

What do you mean by that?
We do have the latest 1.7 patch since the game is from steam and n...

Hi.
My friend just got WaW and I played with him MP with no problems whatsoever, but when I go ahead and try to play with him on zombies (Vanilla zombies, no mods) He cannot join. It says "Joining potential match" and then it says "Game session no longer available". I have h...