If your server is not showing up in Game Tracker you may have to add it to Game Tracker.
You must have an account at Game Tracker and go to the add server feature.
When adding your server remember your game port is 25200 (Usually)
When adding your server remember your query port is 47200. (Usually)
If your server does not show up initially, delete the server, then re-add it to game tracker.
Make sure your server is running and not stopped