Network Address Translation (NAT) service. Mount operation fails with "Permission denied" despite correct permission settings on storage and client end. mount.nfs: prog 100003, trying vers=3, prot=6 m...Network Address Translation (NAT) service. Mount operation fails with "Permission denied" despite correct permission settings on storage and client end. mount.nfs: prog 100003, trying vers=3, prot=6 mount.nfs: trying 10.20.30.40 prog 100003 vers 3 prot TCP port 2049 mount.nfs: trying 10.20.30.40 prog 100005 vers 3 prot TCP port 635 mount.nfs: access denied by server while mounting 10.20.30.40:/vol NAT service is used in the environment to mask the client IP addresses.