Mine hosts just fine with zonealarm setup, and my router running it's own firewall software :P. So linux isn't the only option. But if you expect someone to be able to answer your question based on something as vague as you are giving you're dreaming.
Try stating how your network is setup, or perhaps what your login is set to, the router/cable modem you you are using. Your internal ip's. Can you connect at all? Or just your friends can't connect?
etc.
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Odine Shadow
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