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NTLM-authenticated CIFS session setup failure due to AES for secure channel disabled

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • NTLM authentication
  • DCs require AES encryption for Netlogon RPC sealing (may also apply to environments only requiring RPC signing)

Issue

Despite using a version of ONTAP supporting RPC sealing for Netlogon RPC traffic, Netlogon may fail due to the DCs requiring strong (AES) encryption

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