The Co-op option isn't working for me, and for much people it isnt working to. when i try to join a game it says first; Joining Match, after some while it says unable to join etc. en all weird things like that after that happens. Its really annoying so can anyone help, i tried putting out Firewall but that wont work either :/

I have this problem too. I've tried putting off firewall but no success , and I heard some other people in the chat about this. I guess a fix for this would make many more players play coop.