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Using NFS V3 and TCP!, portmapper is running. Not using iptables.

Following are the options used:

rw,noatime,v3,rsize=32768,wsize=32768,hard,intr,nolock,proto=udp,udp,timeo=11,retrans=5

If I wait for some 20 minutes, then the mount happens.

I'm running RHEL-4.6, 64-bit, kernel version 2.6.9.

How can I fix this?

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Can you post more information? What happens when you ping from your NFS client box to the NFS server? How about a traceroute? Does DNS resolve a FQDN for the NFS server? –  uther Jan 9 '13 at 16:36
    
Yes, the ping is successful with response time 0.150 ms, the filer is addressed by a FQDN and not an ip address, traceroute succeeds with just one intermediate hop. –  Ramkumar Gokarnesan Jan 10 '13 at 11:57
    
I am just throwing this in but I am sure you know that RHEL4 is end of regular lifecycle. –  Dejan Jan 11 '13 at 14:41

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