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CIFS share inaccessible after enabling AES encryption on the SVM

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9
  • CIFS
  • Advanced Encryption Standard (AES)

Issue

  • CIFS share is inaccessible after enabling AES encryption for Kerberos-based communication by the below command

::> cifs server security modify -vserver <svm> -is-aes-encryption-enabled true

  • AES-256 and AES-128 encryption types are not reflected in the CIFS server computer account msDS-SupportedEncryptionTypes properties
PS C:\Users\Administrator> Get-ADComputer cifs01 -Properties  msDS-SupportedEncryptionTypes,KerberosEncryptionType
DistinguishedName             : CN=CIFS,OU=NetAppSVM,DC=ntapp,DC=local
DNSHostName                   : CIFS01.NTAPP.LOCAL
Enabled                       : True
KerberosEncryptionType        : {RC4}
msDS-SupportedEncryptionTypes : 6
Name                          : CIFS01
ObjectClass                   : computer
ObjectGUID                    : 76b04d1c-90da-4a64-be61-eeffd8ee83d3
SamAccountName                : CIFS01$
SID                           : S-1-5-21-3246256033-3924162847-1802636329-1224
  • The following error may be observed in EMS:
[node-01: secd: secd.kerberos.preauth:error]: Kerberos pre-authentication failure due to out-of-sync machine account password for vserver (SVM1).

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