ONTAP 9.14

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Determine whether SMB sessions are signed

You can display information about connected SMB sessions on the CIFS server. You can use this information to determine whether SMB sessions are signed. This can be helpful in determining whether SMB client sessions are connecting with the desired security settings.

  1. Perform one of the following actions:

    If you want display information about…​ Enter the command…​

    All signed sessions on a specified storage virtual machine (SVM)

    vserver cifs session show -vserver vserver_name -is-session-signed true

    Details for a signed session with a specific session ID on the SVM

    vserver cifs session show -vserver vserver_name -session-id integer -instance


The following command displays session information about signed sessions on SVM vs1. The default summary output does not display the “Is Session Signed” output field:

cluster1::> vserver cifs session show -vserver vs1 -is-session-signed true
Node:    node1
Vserver: vs1
Connection Session                                    Open         Idle
ID          ID      Workstation      Windows User    Files         Time
----------  ------- ---------------- ------------- ------- ------------
3151272279  1         DOMAIN\joe          2          23s

The following command displays detailed session information, including whether the session is signed, on an SMB session with a session ID of 2:

cluster1::> vserver cifs session show -vserver vs1 -session-id 2 -instance
                        Node: node1
                     Vserver: vs1
                  Session ID: 2
               Connection ID: 3151274158
Incoming Data LIF IP Address:
    Authentication Mechanism: Kerberos
                Windows User: DOMAIN\joe
                   UNIX User: pcuser
                 Open Shares: 1
                  Open Files: 1
                  Open Other: 0
              Connected Time: 10m 43s
                   Idle Time: 1m 19s
            Protocol Version: SMB3
      Continuously Available: No
           Is Session Signed: true
       User Authenticated as: domain-user
                NetBIOS Name: CIFS_ALIAS1
       SMB Encryption Status: Unencrypted
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