Port Problems

I'm behind a firewall on a network. This FW is blocking port 6112 which I use to play Diablo 2 and Starcraft online. I am looking for a way to capture the traffic from port 6112 and send through another port, say port 400. Is their an easy way to do this on a Window s XP box?

 

rephrased question

Let me re-phrase my question. I'm behind a firewall, which is located on the network server. This firewall is blocking port 6112 which I use to send data. I am looking for a way to forward to redirect the outgoing traffic from port 6112 and send to another port, say port 400, on the computer I'm using. I do not want to send data outside the firewall then have it redirected. Is their an easy way to do this on a computer operating Windows XP Pro?

 

Is this at work? At school? At home? At where?

 

I have no idea what type or brand of firewall it is. I have no access to it or any of its settings. The firewall is on a server of a LAN which am just one user of many. Is there not a program for Windows that can capture packets sent from one program outgoing to one port, and send it thorugh another port? I've found 2 but they only run on Linux based systems.