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Multiple ANONYMOUS LOGON in CIFS session show after enabling encryption

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9
  • CIFS/SMB
  • SMB Encryption

Issue

  • After enabling encryption, cifs session show reports multiple ANONYMOUS LOGON
  • Multiple different session-id are created, but connection-id is the same:

node  vserver  session-id          connection-id windows-user files protocol-version is-session-signed smb-encryption-status
----- -------- ------------------- ----------    ---------------------------   -- ------  ----- ---------
Node1 Vserver1 3151112364572737813 1701772659    AD\John Doe                   12 SMB3_1  false encrypted
Node1 Vserver1 3151112364572738124 1701772659    NT AUTHORITY\ANONYMOUS LOGON  0  SMB3_1  false encrypted
Node1 Vserver1 3151112364572738161 1701772659    NT AUTHORITY\ANONYMOUS LOGON  0  SMB3_1  false encrypted
Node1 Vserver1 3151112364572738165 1701772659    NT AUTHORITY\ANONYMOUS LOGON  0  SMB3_1  false encrypted
Node1 Vserver1 3151112364572740431 1701772659    NT AUTHORITY\ANONYMOUS LOGON  0  SMB3_1  false encrypted

  • Packet trace show multiple Null user authentication:

Client null user.png

 

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