The receiver was not connecting to the server until I opened up the NFS ports in the router. Once I rebooted the server, though, the connection was lost again. Next, I tried opening up more ports in addition to NFS but this time in the XP firewall. Again it worked, but only until I rebooted the server again. Next, I opened up the rest of the ports in the FAQ, and again it worked until rebooting the server.

Each time the connection was lost, I tried rebooting everything - router, bridge, receiver - but nothing worked except manipulating the port openings again.