Online Play (Game Ports)

Ok, after waiting for a day to receive a new serial, and finally be able to log into Impulse, I still cannot play! Everytime I join a Skirmish, it tells me a suitable game is found, but when attempting to join, I cannot.  When browsing through hosted games, I reach a screen that says "connecting to other players" and it sits there.  Anyways, I'm having problems connecting to games.

Well, this is no biggie, really.  I know it is a new game and have seen lots of posts about connection problems and such... so whatever... I'll wait until the dust settles and I can connect.

This post, however, is about port useage. The game guide says for port forwarding, you should open the range from 6100-6200.  When I tried hosting a game to see if anyone could connect to me, it asked for a specified port and was (Auto) by default.  Well, I entered in 6100 instead of (Auto).

Now, here is the thing. Although the manual says the game uses between 6100 and 6200, and even though I entered in 6100 for a port on the hosted game, the game was made using port 6073, which is out of the range and is a closed port for me.  So what ports does this game use exactly?  Why'd it create my game on port 6073?