Ok i've been browsing the forum and finding some things about the connectivity issues. I've forwarded the ports 6073 and 6100-6200. But I still can't connect ot any multiplayer game via demigod itself. If I try to join a game It tries to connect forever to then tell me I've been kicked. When i host a game and wait a bit in the end there will be one or two persons who can join the lobby. Never started a game because people never stay long but their pings are all right (<100). 

So I've downloaded Gameranger and hosted a game there, maybe I was lucky but 3 poeple joined and i could start the game. We played the entiry game without problem or player drops or anything.

So my question is, is it my configuration who causes the problem I can't join any game? Or my config fine and is there not much more I can do?