Policy

Block NTLM Server Exception List

Windows 11 25H2

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Policy overview

Key metadata and intent for this policy.

ClassComputer
CategoryNetwork > Lanman Workstation
Supported onAt least Windows Server 2025, Windows 11

Supported OS tags: Windows11, WindowsServer2025

This policy setting determines if NTLM can be used to access specified servers. If you enable this policy setting (valid only if NTLM (LM, NTLM, NTLMv2) is blocked), NTLM can be used to access servers specified. Please enter the desired servers (DNS name, IP address or NetBIOS name) in the edit box, one server name per line. If you disable or do not configure this policy setting, the NTLM access to servers will be determined by other settings.

Internal name
Pol_BlockNTLMServerExceptionList
Policy ID
b869f7d12bda
Elements
1

Registry values

How enabled and disabled states update the registry.

No explicit registry values are set for enabled or disabled states.

Policy elements

Inputs and configuration options exposed by this policy.

ElementTypeRegistry mappingConstraints & behavior
MultiText_BlockNTLMServerExceptionList
ID MultiText_BlockNTLMServerExceptionList
list
HKLM\Software\Policies\Microsoft\Windows\LanmanWorkstation\BlockNTLMServerExceptionList
Type REG_MULTI_SZ
None

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