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What's the impact of using 'SYSTEM' authentication of a service when accessing SMB Shares

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Applies to

  • ONTAP 9
  • Windows Services

Answer

Preface

Impact

  • If the account uses NTLM then each cifs session will require the SMB server to reach out to the domain controller (DC) to validate the credentials passed
    • This service is called RPC_NETLOGON, ONTAP will open a connection to the DC to pass the creds via netlogon
  • If the cifs session is not reused, each file operation will open a new cifs session and require credential validation via the DC
    • A service that reads {x} files will cause {x} password validations from the SMB server to the DC (very taxing)
  • This issue compounds exponentially when the DC begins to slow down from the excess validation, resulting in SECD failures.

 

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