It appears that rpc.nfsd on RHEL 4 does not support IPv6.
netstat shows the port open for IPv4 conenctions only on an machine
configured with IPv6 addresses.

I removed the
" localhost " entry from /etc/hosts and ensured that
" ::1 localhost " is available.
Now, I tried to start rpc.nfsd stand-alone with

rpc.nfsd -H localhost

and got the error:

"rpc.nfsd: Unknown hostname: localhost"

Is there something that I'm missing?
How can I make NFSv4 daemon accept IPv6 connections on RHEL4 ?