1. Check and make sure that your router (if you have one) has SRB2's ports forwarded properly. Go to http://www.portforward.com for more help on that. Make sure to forward ports 5029 and 5030 on UDP protocol, and of course be careful with the changes you make, and verify that everything is correct.
2. Like Shuffle said, something else may be using ports 5029 and 5030 on the UDP protocol.
3. Please don't use 1337speak that often, such as "u=you," "1=one," and "y=why."
There's a bug that gives you that error if you check the game list before hosting. To fix this problem, simply hit the "End Game" button in the Multiplayer menu, then host.
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