Haematinon: My dear and fellow RPG fans,
I am facing this issue with the NWN multiplayer campaign, actually i am trying to create a Multiplayer game t enjoy the campaign with my friends. I've disabled the windows firewall just in case and i've checked my real ip address by searching on google "my real ip", then i've told to my friends my ip followed by the port number which appears in the advanced option when you are starting the multiplayer game, I've also tried using Xfire and told them just joining my game, but nothing. So, i think the problem is me : (. Do you have any suggestion? I am sorry but i have no experience in this kind of problem and i dont know what to do!
My thanks for your kindness :D

Tallima: #1) Are they using your copy? You all need different CD keys to get into the game.

#2) Try the stand-alone dedicated server.

#3) Try a DMZ to see if it's a port issue

Those might try. I have the hardest time getting mine to work for unknown reasons, too. But those are some good steps you can try.

Also, your ISP may be blocking ports or you might have a NAT IP address from your ISP. You can get a "public" IP address from your ISP if you ask (usually) if you are behind some NAT.