Then I suggest you try out one of the vs ai games here to test, since its the same server we'll be using. If you can connect to one of the generated games you can connect to mine.
http://www.dom3minions.com/HostedGames.htm
And there is a link
http://game.dom3minions.com/how-to.html
with step-by-step instructions of how to connect to it.
If you don't want to play the game out just set yourself to ai in options.