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Impact of setting CIFS option -restrict-anonymous to no-access

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • CIFS

Answer

  • Setting vserver cifs options modify -restrict-anonymous no-access effectively disables SMB  Null Sessions  (anonymous logons).
  • Normal authenticated access (Kerberos/NTLMv2) by domain-joined clients and apps is unaffected.
  • Impact is typically limited to tools or workflows that depend on anonymous enumeration or anonymous IPC$ connections, such as:
    • Asset/vulnerability scanners or monitoring tools that use anonymous SMB to list shares or query SAMR/LSA will fail (e.g., smbclient -L //server -N or net view \server without creds).
    • Workgroup or non-domain machines that relied on viewing shares without credentials will be denied and must provide credentials.
    • Very old apps/clients that depend on legacy anonymous/SMB1 behaviors may break. If SMB1 is already disabled, this risk is even lower.

Additional Information

 

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