Port

I am having trouble playing a game (online) called Warcraft3 using Internet Connection Sharing against remote friends also using ICS. I can use ICS to play random opponents though. The tech support page:
http://www.blizzard.com/support/?id=msi0445p

suggests this:
In order to connect to Battle.net, thru your Local Area Network, while allowing others to connect to games you create, make sure you have the following ports setup as described below.
Warcraft III:
Allow port 6112 TCP out and allow established sessions in
Allow port 6112 TCP in (hosting custom games)
Allow port 6113-6119 TCP out and in (hosting custom games if you’ve changed the default port in the Options/Gameplay screen)

How do I find/change these settings? I have searched the boards and tried HELp but can't find answer.
I share connection of a cable modem using a hub. My main PC acts as gateway. I do not use a firewall.
TiA

 

Take a look at this page and see if their free utility will do what you need.

If not, try a Google search for "ICS open ports "...which is where I found the link to the above page.