RHEL - NFSv4.1 mount hungs and packet capture displays V4 Reply SEQUENCE Status NFS4ERR_SEQ_MISORDERED

Solution Verified - Updated -

Issue

  • Mounting an NFS share with NFSv3 is successful.

    # mount -t nfs3 nfs-server1:/share /mnt/path

  • Trying the same mount with NFSv4.1 hungs.

    # mount -t nfs4 nfs-server1:/share /mnt/path -vvv
mount.nfs4: timeout set for Mon May 10 09:07:21 2021
mount.nfs4: trying text-based options vers=4.2,addr=172.16.31.60,clientaddr=172.16.31.61'
mount.nfs4: mount(2): Protocol not supported
mount.nfs4: trying text-based options 'vers=4,minorversion=1,addr=172.16.31.60,clientaddr=172.16.31.61'
<HUNG>

Environment

  • Red Hat Enterprise Linux (RHEL) 8.
  • Dell EMC Unity 480 NAS with NFS server enabled.

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