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What action will be taken when the client only supports RC4

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ontap-9
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Applies to

  • ONTAP 9
  • CIFS/SMB
  • Kerberos Authentication
  • Advanced Encryption Standard (AES)

Answer

When dealing with encryption compatibility between clients, domain controllers (DC), and ONTAP, the behavior varies based on the supported encryption types.
Here are the scenarios:
  • Client: RC4 only, DC: AES/RC4, ONTAP: AES/RC4
    • Both the client and the DC support RC4, so Kerberos authentication will use RC4 encryption.
    • The communication between the client and the DC will be successful, and a Kerberos ticket will be issued, allowing the client to access the CIFS shares.
  • Client: RC4 only, DC: AES only, ONTAP: AES/RC4
    • The client does not support AES encryption, which is required by the DC.
    • As a result, the client will not be able to authenticate with the DC using Kerberos, and no Kerberos ticket will be issued.
    • Consequently, the client will not be able to access the CIFS shares.

Additional Information

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