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NetApp Knowledge Base

How to troubleshoot SMB Signing on a NetApp Storage Controller

Last Updated:

Applies to

  • Clustered Data ONTAP 8.2    
  • Data ONTAP 8.2 7-Mode    
  • ONTAP 9 


SMB Signing is a feature in CIFS that adds a digital signature to a packet transferred between clients and servers. This feature allows the receiver to confirm the packet's origin and authenticity. The failure of a client and server properly negotiating the need or requirement for SMB Signing can result in an unsuccessful connection to a CIFS share.
For further information on SMB Signing and the use cases, see the following articles:

This article covers both Data ONTAP 7-Mode and clustered Data ONTAP. See the appropriate section of this article for the version of Data ONTAP that is running. It might be necessary to capture a packet trace to troubleshoot SMB Signing. At the end of the article is a walk-through on how to review a packet trace to determine if SMB Signing is causing an issue with initial share connection.





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