Hello,
Steam had an issue which prevented some multiplayer games from working, which was fixed in a recent update. Please make sure your steam client is updated (go to Steam -> Check for Steam Client Updates, in the upper left corner) and try again, and please let us know if the problems persist.
Steam had an issue which prevented some multiplayer games from working, which was fixed in a recent update. Please make sure your steam client is updated (go to Steam -> Check for Steam Client Updates, in the upper left corner) and try again, and please let us know if the problems persist.