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    • https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/Unable_to_read_or_write_to_a_CIFS_share_even_when_expecting_valid_permissions
      Applies to When a client attempts to read from a CIFS share, access is denied due insufficient permissions Sufficient permissions are expected, and may even be observed for other clients running simil...Applies to When a client attempts to read from a CIFS share, access is denied due insufficient permissions Sufficient permissions are expected, and may even be observed for other clients running similar workloads/applications A security trace show that the impacted Windows client tries to access the share with a NULL user and not with valid credentials: Cluster01 1 Security Style: NTFS and Access is denied. NT ACL requested permissions are not granted for: "Read Control", "Write", "Read"
    • https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/CIFS_disconnect_while_copying_data_when_encryption_is_enabled_and_NULL_sessions_are_created
      Network Error: There is a problem accessing <path>. Make sure that you're connected to the network and try again Every time a Windows client, with Microsoft Defender enabled, sends an encrypted packet...Network Error: There is a problem accessing <path>. Make sure that you're connected to the network and try again Every time a Windows client, with Microsoft Defender enabled, sends an encrypted packet, ONTAP resets the TCP stream 588 ... <ip-1> <ip-2> SMB2 281 57663 445 0 - - <domain> NULL NULL Session Setup Request, NTLMSSP_AUTH, User: \ anonymous (null) login, no user (User: \), so as you can see the CIFS/SMB server sends a TCP [RST] to the CIFS/SMB client, see frames: 593,595,597