1. Run DMZ on your computers ip (if your router has that function - to open every single port to that ip)

or

2. Try defaulting your router and modem and resetting them up

Update - Seemed good at first... I connected to a Pantheon game suprisingly painlessly that was a 3vs3 with 1 AI each...  About 10 minutes in, everyone apparently got kicked and I was left with all AI's.

actually monk its not everyone else getting kicked, its him getting kicked and replacing everyone with AI's while the remaingin 5 people play their game and the dropped player is replaced with an AI, happens to my friend ever time we play after about an hour of playing it just drops him from the game

@ Javaslinger,

Do you know if your cable modem might also be performing NAT?

For instance...you may have placed your PC's IP into the DMZ on your router (thereby opening all traffic to your PC from the router) but if your modem is also set to perfom NAT instead of simply being a "pass-through" then all you've achieved is to allow all traffic from your router to your PC, but it's not even getting to the router because it's being blocked at the modem.

Please check my reply in this thread:

http://forums.demigodthegame.com/347846

thanks,

the Monk