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

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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
 
External link - configuring-kerberos-over-ip
 
 

Additional Information

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