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NFSv4 mount with krb5 security fails with "access denied by server" due to unsupported encryption

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9
  • NFSv4
  • Kerberos

Issue

  • On NFSv4 mount using sec=krb5, the mount fails with access denied by server while mounting nfs-svm.example.com:/nfs_krb5_mnt
  • NFSv4 mounts using sec=sys succeeds.
  • ONTAP reports this as shown below:
Cluster1::> event log show -node node1 -message-name secd*
Time                Node             Severity      Event
------------------- ---------------- ------------- ---------------------------
5/9/2021 14:09:51   node1            ERROR         secd.nfsAuth.problem: vserver (svm01) General NFS authorization problem. Error: RPC accept GSS token procedure failed
  [  0 ms] Using the NFS service credential for logical interface 1030 (SPN='nfs/xxxxxxxxx') from cache.
**[     1] FAILURE: Failed to accept the context: Unspecified GSS failure.  Minor code may provide more information (minor: Encryption type ArcFour with HMAC/md5 not permitted).

 

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