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Is an SPN update required when a DNS CNAME is switched to another SMB file server during business continuity failover with Kerberos authentication

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • SMB (CIFS) protocol
  • Microsoft Active Directory
  • Kerberos authentication

Answer

  • Yes, an SPN update required when a DNS CNAME is switched to another SMB file server during business continuity failover with Kerberos authentication

  • When SMB access uses Kerberos authentication with a DNS CNAME, the Service Principal Name (SPN) for that CNAME must be registered on the Active Directory (AD) computer object of the file server that is actively serving SMB.

  • If the DNS CNAME is repointed to a different file server during business continuity failover, Kerberos authentication fails unless the required SPNs are updated on the new active file server.

     

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