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Can RC4 encryption for Kerberos-based communication be disabled?

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • Domain Controller

Answer

  • In 9.12 and above, you can disable advertising the RC4 encryption type
  • In 9.11 and below, you cannot disable RC4 encryption for Kerberos-based communication
    • Even when AES encryption for Kerberos-based communication is enabled on a vserver, advertising the RC4 encryption type cannot be disabled
  • When AES and RC4 are both enabled, the vserver will always use AES
    • Unless the client requests RC4 specifically, then RC4 is provided instead of AES
    • The strongest encryption type is selected by the DC that provides the Kerberos ticket if multiple are available
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