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NTLM fails despite RequireSeal:1 on DCs for CVE-2022-38023

Last Updated:

Applies to

  • ONTAP 9
  • NTLM
  • CVE-2022-38023


  • Unable to access CIFS share via NTLM authentication using IP

Note: Access via FQDN or HOSTNAME may work

  • Domain Controller (DC) Windows Event log shows ERROR for Event ID 5838 for affected SVM and references Windows OS:


Log Name: System
Date: 4/21/2023 8:06:11 AM
Event ID: 5838
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: demodomadc1.demo.domaina.local
The Netlogon service encountered a client using RPC signing instead of RPC sealing.

Machine SamAccountName: CIFSSERVERNAME
Domain: demo.domaina.local.
Account Type: Domain Member
Machine Operating System: Windows 10 Enterprise
Machine Operating System Build: 10.0 (19044)
Machine Operating System Service Pack: N/A
Client IP Address: Unknown IP

Note: AD computer object for SVM's CIFS server has Machine Operating System attribute set to Windows

  • CIFS access fails using Netlogon service:
4/16/2023 23:13:02  NODE1     ERROR         secd.cifsAuth.problem: vserver (SVM1) General CIFS authentication problem. Error: User authentication procedure failed (Retries: 2)
CIFS SMB2 Share mapping - Client Ip =
**[    22] Attempt 1 FAILURE: Unexpected state: Error 6756 at file:src/FrameWork/ClientInfo.cpp func:RemoveAllSharesFromGlobalSession line:4034
**[    22] Attempt 1 FAILURE: Pass-through authentication failed. (NT Status: NT_STATUS_NO_LOGON_SERVERS(0xc000005e))
**[    36] Attempt 2 FAILURE: Unexpected state: Error 6756 at file:src/FrameWork/ClientInfo.cpp func:RemoveAllSharesFromGlobalSession line:4034
**[    36] Attempt 2 FAILURE: Pass-through authentication failed. (NT Status: NT_STATUS_NO_LOGON_SERVERS(0xc000005e))
[ 36 ms] Login attempt by domain user 'Netapp\user' using NTLMv2 style security
[    37] Successfully connected to ip, port 445 using TCP
[    44] Successfully authenticated with DC
**[    59] FAILURE: Pass-through authentication failed. (NT Status: NT_STATUS_NO_LOGON_SERVERS(0xc000005e))
[    59] CIFS authentication failed
[    59] Retry requested, but maximum attempts (3) reached; giving up.

Note0xc000005e is a generic error, hence all symptoms need to match

  • Since April 11, 2023 Microsoft Windows patch for CVE-2022-38023 is installed on DCs and RequireSeal registry value is set to 1 (Compatibility mode)
  • Verify the CIFS server name of SVM:

::*> cifs show -vserver SVM1

Vserver: SVM1
NetBIOS Domain/Workgroup Name: DEMO
Fully Qualified Domain Name: DEMO.DOMAINA.LOCAL
Organizational Unit: CN=Computers
Default Site Used by LIFs Without Site Membership:
Workgroup Name: -
Kerberos Realm: -
Authentication Style: domain
CIFS Server Administrative Status: up
CIFS Server Description:
List of NetBIOS Aliases: -

  • Confirm OperatingSystem attribute via PowerShell on DC:

PS C:\Users\Administrator> Get-ADComputer CIFSSERVERNAME -Properties OperatingSystem,OperatingSystemVersion
DistinguishedName      : CN=CIFSSERVERNAME,CN=Computers,DC=demo,DC=domaina,DC=local
DNSHostName            : cifsservername.demo.domaina.local
Enabled                : True
Name                   : CIFSSERVERNAME
ObjectClass            : computer
ObjectGUID             : 39c55236-7d8d-4c7d-a24b-aee1899e6053
OperatingSystem        : Windows 10 Enterprise
OperatingSystemVersion : 10.0 (194044)
SamAccountName         : CIFSSERVERNAME$
SID                    : S-1-5-21-441962528-1452217077-79953549-1312
UserPrincipalName      :


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