Hey man, do you have any instructions on how to do multiplayer over TCP, trying to play with a friend overseas. We've opened the ports in windows firewall and router and no luck joining the same game together...
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After open TCP AND UDP ports, you should be able to connect. There's no other way. I play it very often with no problems. There's something blocking the connection most probably. Disable the router firewall if there's any. I should warn you though, the internet gameplay it's a little buggy at the time. If the connection is not good and not very fast, it will mostly break from time to time. I usually play in on the internet with friends under a solid connection.