I have been trying to use a common $HOME on our 2 dedicated servers via
NFS and it fails. If I use udp the mount fails with this error on the
client.
mount.nfs: Input/output error
while /var/log/messages shows an authenticated mount request on the server.

If I try to mount via tcp it gives me a no route to host error.
rpcinfo will work as long as I do not run it as root.

I suspect there is something blocking this network traffic. I have
appropriate entries in hosts.allow and /etc/exports. I have disabled
selinux and turned of iptables. I have started the appropriate daemons
on the server side. I have tried using other machines on which I know
this works as both client and server and I get the same errors. Do
you have any ideas about what is going on?

Thank you!