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CIFS access denied errors in ONTAP 9 after enabling  SMB encryption

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ontap-9
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Applies to

  • CIFS/SMB
  • ONTAP 9
  • Linux/Unix
  • Windows

Issue

  • After enabling "-is-smb-encryption-required" CIFS security option, some clients are no longer able to access CIFS shares and seeing access denied errors.
  • The issue impacts clients running Windows versions earlier than 8, Server 2012, RHEL version below 7.5, while newer clients are still able to access shares.
  • The issue impacts shares that have CIFS share property 'encrypt-data' enabled as well.
  • In trace, we're seeing "STATUS_ACCESS_DENIED" being returned to Session Setup Requests.
  • EMS may report Nblade.cifsEncSessAccessDenied or Nblade.cifsEncShrAccessDenied

 

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