It has happened to some games (CS:GO, Garry's Mod, Age of Empires 3, maybe some others that I haven't tried). My friend just can't connect to my hosted games and I can't connect to his, but with other people it works fine. But in some games he can join (Space engineers).
And now he or I cant even join in the same server no matter who's hosting. Whats happening?! (this only happens in AoE 3, so far)
Some extra info:
We're both running Windows 7 Ultimate I guess we do have an Exteranl IP address but most of the servers aren't the dedicated ones , they're the ones that you just press host game and friends join you.
Now I tried and with Dedicated servers he can join just fine so its just with the Game hosted servers I guess.
Do I need to port forward for a non-dedicated server? I think that i dont have to
And atleast in Age Of Empires 3 we cannot join random servers together , only one of us can be in a server.