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CIFS clients disconnected when nblade.smbsignaturemismatch events observed in EMS

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Category:
ontap-9
Specialty:
nas
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Applies to

  • ONTAP 9
  • CIFS

Issue

  • CIFS clients are intermittently disconnected from CIFS shares and unable to access data
  • Rebooting the client temporarily resolves the issue
  • nblade.smbsignaturemismatch events are observed in EMS when the client disconnects occur
  • Packet traces show the clients were originally signing, then stopped signing when this occurs
  • Instead of a valid signature they send a signature of all zeroes
  • Signing is not required on the SVM in question

 

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