NFS clients are intermittently unable to mount RHEL5 NFS server export, and server logs show "mountd[XXXX]: refused mount request from X.X.X.X for /export (/export): illegal port XXX"

Solution In Progress - Updated -

Issue

  • RHEL NFS clients are intermittently unable to mount RHEL5 NFS server export.
  • RHEL5 NFS server logs show "mountd[XXXX]: refused mount request from X.X.X.X for /export (/export): illegal port XXX"

Environment

NFS server: Red Hat Enterprise Linux 5
NFS client: Red Hat Enterprise Linux 5, 6, 7

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