I'm not sure if I understood totally what you meant, but if your trying to host your own server behind a hardware firewall, then just set your dedicated server port to allow.
Now, if your behind a router/firewall type problem, then you need to use a port redirect system. Ex.
In your firewall, you add a service with the ports 27000 to 27300 set to tcp. Then you create a rule and redirect/map the incoming traffic to your local ip address (usually 127.0.0.1).
Then any user connecting to your router's ip with the port 27010 will be redirected to your machine on that same port. <!--emo&:D--><img src='http://www.unknownworlds.com/forums/html/emoticons/biggrin.gif' border='0' valign='absmiddle' alt='biggrin.gif'><!--endemo-->
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Now, if your behind a router/firewall type problem, then you need to use a port redirect system. Ex.
In your firewall, you add a service with the ports 27000 to 27300 set to tcp. Then you create a rule and redirect/map the incoming traffic to your local ip address (usually 127.0.0.1).
Then any user connecting to your router's ip with the port 27010 will be redirected to your machine on that same port. <!--emo&:D--><img src='http://www.unknownworlds.com/forums/html/emoticons/biggrin.gif' border='0' valign='absmiddle' alt='biggrin.gif'><!--endemo-->