RHEL 6 NFS mount errors with "clnt_create: RPC: Unknown host"

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Issue

When attempting to mount an NFS share from a RHEL 6 server, the mount fails with:

clnt_create: RPC: Unknown host

Performing a showmount -e on a RHEL 6 NFS server fails with:

clnt_create: RPC: Unknown host

Environment

Red Hat Enterprise Linux 6

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