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Dude, how do you guys even play...? We can't see the server in our network, no matter what we do.
Well, hello servers! :D There are basically two ways to solve this problem: either "ServisPak2" or the firewall is blocking it, but I doubt the firewall is enabled, or you're creating the game incorrectly (although that's hard to do :)). I saw a step-by-step guide on how to create a server somewhere ;)