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Block NTLM Server Exception List

Policy ID
Pol_BlockNTLMServerExceptionList
Scope
Computer Configuration
Supported on
At least Windows Server 2025, Windows 11
Source
Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category
Network › Lanman Workstation

Description

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.

Options

  • Block NTLM Server Exception List:

Registry

ComputerHKEY_LOCAL_MACHINE
HKLM\Software\Policies\Microsoft\Windows\LanmanWorkstationView registry values
  • BlockNTLMServerExceptionListREG_MULTI_SZ

Other policies in the same category

View all policies in this category (19)