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Is it possible to disable SMB2 and keep SMB3 enabled in ONTAP?

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707
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Category:
ontap-9
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nas
Last Updated:

Applies to

ONTAP 9

Answer

  • It is not possible to just disable SMB2 and keep SMB3 enabled in ONTAP
  • Attempt to disable SMB2 (with SMB1 disabled by default from ONTAP 9.3) on SVM will fail with below error
::> cifs options modify -vserver svm -smb2-enabled false
Error: command failed: Cannot disable SMB2 protocol on Vserver "svm" because other versions of the SMB protocol are already disabled or being disabled.
 
NOTE:
  • One way to allow only SMB3 client connections is by enabling encryption on the shares. 
  • Only SMB3 clients support SMB encryption
  • SMB clients ( SMB1 , SMB2 ) that do not support encryption cannot connect to a SMB server or share that requires encryption.
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