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What happens when the preferred domain controller for CIFS Server is demoted

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Applies to

  • ONTAP 9
  • Windows Server 2016 (Old domain controller)
  • Windows Server 2025 (New domain controller)

Answer

When the preferred domain controller(DC) for the CIFS Server in a NetApp ONTAP environment is demoted, the following occurs:

  1. Authentication Shifts to WS2025:

    • After WS2016 is demoted, all authentication processes will shift to WS2025.

  2. Kerberos Authentication Issues:

    • WS2025 does not support RC4 encryption. If ONTAP has cached Kerberos tickets or keys negotiated with the old WS2016 DC, authentication with the new WS2025 DC may fail.

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