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The LanMan authentication level must be set to send NTLMv2 response only, and to refuse LM and NTLM.


Finding ID Version Rule ID IA Controls Severity
V-220938 WN10-SO-000205 SV-220938r569187_rule High
The Kerberos v5 authentication protocol is the default for authentication of users who are logging on to domain accounts. NTLM, which is less secure, is retained in later Windows versions for compatibility with clients and servers that are running earlier versions of Windows or applications that still use it. It is also used to authenticate logons to stand-alone computers that are running later versions.
Microsoft Windows 10 Security Technical Implementation Guide 2023-09-29


Check Text ( C-22653r555299_chk )
If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Path: \SYSTEM\CurrentControlSet\Control\Lsa\

Value Name: LmCompatibilityLevel

Value Type: REG_DWORD
Value: 5
Fix Text (F-22642r555300_fix)
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: LAN Manager authentication level" to "Send NTLMv2 response only. Refuse LM & NTLM".