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Can DES encryption for Kerberos-based communication be disabled on a CIFS server?

Last Updated:

Applies to

  • ONTAP 9.12+
  • CIFS
  • Kerberos
  • Data Encryption Standard (DES)
  • Domain Controller (DC)


  • Yes, this is possible, depending on the ONTAP 9 version
    • On versions with enhancement 1438811 configure the advertised encryption types for cifs security and do not include DES
      • The options on 9.12 include des, rc4, aes-128, and aes-256
      • Example showing the value being set to aes-128,aes-256 so that neither DES nor RC4 are used
        • ::> cifs security modify -vserver vserver -advertised-enc-types aes-256,aes-128
        • ::> cifs security modify -vserver vserver -advertised-enc-types aes-256,aes-128
      • Verification
        • ::> cifs security show -vserver vserver -fields advertised-enc-types
          vserver     advertised-enc-types
          ----------- --------------------
          vserver     aes-256,aes-128

    • Can I disable RC4 encryption for Kerberos-based communication
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