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    • https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/Why_is_first_a_SMB2_Authentication_request_with_an_error_ACK_ed_via_TCP
      Applies to CIFS The reported events are normal CIFS (SMB2) NTLM(v2) session setup (authentication) events and hereby some explanations client: Session Setup Request (NTLMSSP_NEGOTIATE) ⇔ server: Sessi...Applies to CIFS The reported events are normal CIFS (SMB2) NTLM(v2) session setup (authentication) events and hereby some explanations client: Session Setup Request (NTLMSSP_NEGOTIATE) ⇔ server: Session Setup Response (NTLMSSP_CHALLENGE): Error: STATUS_MORE_PROCESSING_REQUIRED (additional authentication information needs to be exchanged: domain\user) client: ACK ⇔ server: Session Setup Response client: Session Setup Request (NTLMSSP_AUTH): User: <domain\user> ⇔ server: Session Setup Response