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Loss of CIFS access during ANDU
https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/Loss_of_CIFS_access_during_ANDU
Applies to ONTAP 9 Issue During Automated Non-Disruptive Upgrade (ANDU) for ONTAP, CIFS users temporarily lose access to CIFS share.

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