Hosting help

This is my problem

1. I cant host games so people can join them.

Here is my setup:

1. I am using Norton antivirus internet security
2. I allow all ports for Warcraft III to go
to/from my computer and others
3. I am on cable
4. I have a hub so I have internet connection
sharing between my 2 computers
5. I have a masked IP address for my network

Neither one of my computers can host games... my friend JUST got cable and can host perfectly fine, even when I disable my firewall I still cant host, so I think it might be something with my network. I really want to be able to host so when I host games like maul TD games I can be the color I want and I can do AT games with friends that cant host either, so any help would be greatly appreciated. Thanks in advanced, I hope I get an answer after writing this long letter.