Firestarter/ufw, proxy, and no connect
 

I'm using a local (as in on my linux machine) proxy server VPN'd to another network.

How do I setup either Firestarter or ufw to ONLY allow in/out from ONE port? (The one port the proxy uses)

Ex: Firefox is proxied to 127.0.0.1, all ports, and then the proxy picks it up, and sends out on port xxxx, and recieves on port xxxx, then sends back thru 127.0.0.1, back to Firefox.

Any setting/rules I've tried on either Firestarter or ufw kills the proxy>VPN (Proxy won't connect to remote network)

It's probably fairly easy, but my mind is mush right now