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[Lucullus]

Well I use Windows XP SP2, so it will be a bit different for SP1 I think, but here are some screenshots to show the process:


Go into Security Center


Go into Windows Firewall


In the options screen go to Exceptions


Click on Add port to specify the port you want open in windows


Give the port opening a name and the port number... and finally select TCP or UDP (can't remember the difference) you should get both TCP and UDP added to ensure effectiveness.

And finally you open the port on your router or cablemodem(not sure if there is an option for that on modems, don't use them)

Hope this helps a bit, but it's worked for me in most circumstances.