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CIFS access denied errors in ONTAP 9 after enabling  SMB encryption

  1. Last updated
    Feb 21, 2025
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Category:
ontap-9
Specialty:
nas
Last Updated:
2/21/2025, 5:23:59 AM

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 applied as well.
  • In a packet trace, we see STATUS_ACCESS_DENIED being returned to Session Setup or Tree Connect requests
  • EMS may report Nblade.cifsEncSessAccessDenied  or  Nblade.cifsEncShrAccessDenied
  • When the issue is captured in a security trace this will contain the reason for the access being denied

example

::> vserver security trace trace-result show

 Vserver: svm1


 Node            Index Filter Details             Reason
 --------------- ----- -------------------------- -----------------------------------------------------------------
 node1           1     Security Style:  -         Session Setup failed, client does not have encryption capability.

 

 

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