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