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CIFS shares not accessible after VDI GPO push

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ontap-9
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nas
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Applies to

  • ONTAP
  • Windows 11-based VDIs running Windows 11 23H2 (Multisession capable)
  • CIFS

Issue

  • Users are not able to access the netapp storage (CIFS Shares) after DCs were patched with MS patch for CVE-2025-49716.
  • After the issue occurred, patches to DCs were backed out, but problem persisted.
  • The packet traces  shows that the clients were doing a Tree Connect using SMB2 signatures to connect to a share but when the client attempted to do a Create to open the root of the share, it was not using SMB2 signatures.

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