NFSv4: NFS clients hang when accessing a NFS share

Solution Verified - Updated -

Issue

  • NFS clients hang when accessing a NFS share.
  • Rebooting the NFS client resolves the hang.
  • The NFS server is logging gssproxy: server localhost not responding, timed out during the NFS client hang.
  • Looking at a packet capture, the NFS client is constantly sending V4 NULL Call and the NFS server is never sending a V4 NULL Reply.

Environment

  • NFSv4.x
  • Red Hat NFS client
    • Kerberos keytab with nfs/root/home Principal
  • Red Hat NFS server
    • Red Hat Enterprise Linux 7
    • gssproxy

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