I did host a game :

On my pc it shows sometimes that the game (test server, my game) is on, sometimes not.
Of course i refresh the page. So that cant be it.
I did join jcstalk and ask someone to join my game, but he didn't see the game to.

I have read the whole technical forum with problems that possible like this, but the only thing i can get out it is that some people have problems with the linksys router
(mine is Wireless-G Broadband Router WRT54G)

I cant solve it, i am not that kind of network hero