RPC Timeout

I have a RHEL 2.1 machine that I am trying to get to mount a remote nfs filesystem. Both servers have 2 network interfaces. My linux machine can mount the filesystem through one interface with no problems but if I switch over and try to mount it through the other interface using a totally different IP on a totally different addressing scheme I get a RPC timeout error. They see each other and can ssh into each other through both network interfaces. Does anybody have any ideas? THANKS!!!

I figured it out. I just needed to flush the ipchains.