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Why is kerberos not being used when connecting to a CIFS server by IP?

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ontap-9
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nas
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Applies to

  • ONTAP
  • Service Principal Name (SPN)
  • Storage Virtual Machine (SVM)
  • Active Directory (AD)
  • Kerberos

Answer

To use kerberos, the client has to obtain a kerberos ticket based on the SPN (Service Principal Name) for SVMs machine account in Active Directory. As the SPN is based on the server name, a kerberos ticket cannot (normally) be obtained if connecting by IP.
 
Beginning w/ Windows 10 version 1507 and Windows Server 2016, Kerb clients can be configured to support IPv4 and IPv6 hostneames in SPNs
 
 
 

Additional Information

You can use e.g. ADSI Edit to find the servicePrincipalName property for the machine account.
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