When mount is triggered for an already mounted NFS v3 export, it displays "mount.nfs: Protocol not supported" instead of "Device or resource busy"

Solution Verified - Updated -

Issue

  • Triggering a mount of an already mounted NFS v3 export gives misleading errors.
  • Failing NFSv3 mounts shows "mount.nfs: Protocol not supported" even though the protocol is enabled on NFS server.
  • NFS v4 errors are reported for failing NFS v3 mounts.

Environment

  • Red Hat Enterprise Linux 7.9
  • Red Hat Enterprise Linux 8

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