rpcinfo -p doesn't work

[Dave Martini 1]

I have an RHEL 4 client when I do rpcinfo -p hostA it doesn't show any 
output.
Is this a problem with the RHEL client or the hostA machine? I can do 
rpcinfo -p hostA from other
clients and it works but not from my RHEL4 client.

How do I check iptables to see if it's being blocked? How do I check it 
the firewall is on? Is there a gui
to check?