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Kerberos CIFS authentication fails for users with many groups

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Category:
ontap-9
Specialty:
nas
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Applies to

  • ONTAP 9
  • CIFS/SMB
  • Kerberos

Issue

  • Users with a large number of groups are unable to connect to CIFS shares via FQDN (kerberos). Able to connect via IP (NTLMv2).
  • EMS shows:
    • SECD.CIFSAUTH.PROBLEM:VSERVER General CIFS authentication problem. Error: User authentication procedure failed CIFS SMB2 Share mapping – Client IP = xxx.xxx.xxx.xxx (3 ms) Could not decode user claims information in Kerberos ticket.
  • Windows Client shows:
    • A ticket to the service cifs/"DC Name"/"DomainName" is issued for account "AccountName"@"DomainName". The size of the encrypted part of this ticket is 22648 bytes, which is close or greater than the configured ticket size threshold (15000 bytes)

 

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