Me and two friend have Far Cry 3 and want to play coop together, but when joining game i get 'cannot connect' my friends can connect to each other but I cant, although i never have any problems with any online games. Ive been reading through the forums and it seems like this is a big problem.
I would check router ports(or better put your PC in the DMZ) and make a firewall rule for the game see if that helps you out.
But in the end the COOP is very disappointing(IMO) and gets old real quick when it could have been freaking awesome...if we could only have COOP like the single player mission this game would rule.![]()