Game Host Failure

M'kay, so recently my old router busted, so I had to get a new one. I did all the port forwarding and such, and it worked fine. However, my netgame has constantly been wanting to use different ports other than 5029, so my netgames don't work, because the ports aren't forwarded. Everytime I do forward to that port, my game just goes to another port next time I host.

What's going on here?

Well, have ya tried hosting the game when ya put the Master Server option to "On" or "Yes"?

Well, of course. If I didn't, I wouldn't even be able to listserv my server to see if it's on the right port.

I still need help. >.<