I have had this problem for days. I was happily playing the game online without issue. Next morning I wake up and I can't play multiplayer. I tried turning of Anti-Cheat, problem persists. I flushed the DNS settings with ipconfig - problem persists. Multiple reboots, validated the files, reinstalled the game, and the problem persists. Can anyone please help me resolve this issue so I can play this game with my friends? I used a different computer in my house and it connects without any problems. Unfortunately this one computer started having this problem and it won't go away. I have looked around for solutions and I am really in need of some help.