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I might be a little late to reply but I hope this helps.

Quote:

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)

http://www.blizzard.com/support/?id=awr0655p

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Routers and Warcraft III:

1. Make sure you have the latest updates installed from your Router manufacturer.
2. Configure the Game Port Warcraft III will use on each computer:
1. Start Warcraft III on each computer
2. Click Options
3. Click Gameplay
4. Approximately half way down the screen you will see Game Port, each of your computers will need to use a different port
Example: Computer #1 can use port 6112, computer #2 can use port 6113, computer #3 can use port 6114, and so on.
3. Configure your Router to forward the incoming data for port x to the computer where you setup Warcraft III to use that port
For more information on configuring your router, please contact your router manufacturer.
4. Try playing the game

http://www.blizzard.com/support/?id=awr0655p