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NTLM Enhanced Blocking: registry value EnhancedNtlmBlocks and 5 moreComputerHKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters

Policy ID
BlockNtlm
Scope
Computer Configuration
Supported on
At least Windows 11 Version 24H2
Source
Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category
System › NTLM

Registry

EnhancedNtlmBlocks

REG_DWORDComputer
HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters Current key
Enabled value
1
Disabled value
0
Apply with .reg · CMD · PowerShell
.reg
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters]

; Options (use only one)
; Enabled
"EnhancedNtlmBlocks"=dword:00000001
; Disabled
"EnhancedNtlmBlocks"=dword:00000000
CMD
:: Options (use only one)

:: Enabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "EnhancedNtlmBlocks" /t REG_DWORD /d 1 /f
:: Disabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "EnhancedNtlmBlocks" /t REG_DWORD /d 0 /f
PowerShell
# Common: create the key
New-Item -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Force | Out-Null

# Options (use only one)
# Enabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'EnhancedNtlmBlocks' -PropertyType DWord -Value 1 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'EnhancedNtlmBlocks' -PropertyType DWord -Value 0 -Force | Out-Null

BlockDomainAccountSSO

REG_DWORDComputer
HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters Current key
Enabled value
Depends on the option value
Element
Block NTLM for Domain Accounts Single Sign-On
Options
ItemStored value
Audit1
Enabled2
Disabled0
Apply with .reg · CMD · PowerShell
.reg
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters]

; Options (use only one)
; Audit
"BlockDomainAccountSSO"=dword:00000001
; Enabled
"BlockDomainAccountSSO"=dword:00000002
; Disabled
"BlockDomainAccountSSO"=dword:00000000
CMD
:: Options (use only one)

:: Audit
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "BlockDomainAccountSSO" /t REG_DWORD /d 1 /f
:: Enabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "BlockDomainAccountSSO" /t REG_DWORD /d 2 /f
:: Disabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "BlockDomainAccountSSO" /t REG_DWORD /d 0 /f
PowerShell
# Common: create the key
New-Item -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Force | Out-Null

# Options (use only one)
# Audit
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'BlockDomainAccountSSO' -PropertyType DWord -Value 1 -Force | Out-Null
# Enabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'BlockDomainAccountSSO' -PropertyType DWord -Value 2 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'BlockDomainAccountSSO' -PropertyType DWord -Value 0 -Force | Out-Null

BlockDomainControllerAuth

REG_DWORDComputer
HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters Current key
Enabled value
Depends on the option value
Element
Block NTLM for Domain Controllers
Options
ItemStored value
Audit1
Enabled2
Disabled0
Apply with .reg · CMD · PowerShell
.reg
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters]

; Options (use only one)
; Audit
"BlockDomainControllerAuth"=dword:00000001
; Enabled
"BlockDomainControllerAuth"=dword:00000002
; Disabled
"BlockDomainControllerAuth"=dword:00000000
CMD
:: Options (use only one)

:: Audit
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "BlockDomainControllerAuth" /t REG_DWORD /d 1 /f
:: Enabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "BlockDomainControllerAuth" /t REG_DWORD /d 2 /f
:: Disabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "BlockDomainControllerAuth" /t REG_DWORD /d 0 /f
PowerShell
# Common: create the key
New-Item -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Force | Out-Null

# Options (use only one)
# Audit
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'BlockDomainControllerAuth' -PropertyType DWord -Value 1 -Force | Out-Null
# Enabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'BlockDomainControllerAuth' -PropertyType DWord -Value 2 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'BlockDomainControllerAuth' -PropertyType DWord -Value 0 -Force | Out-Null

EnforceMachineBinding

REG_DWORDComputer
HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters Current key
Enabled value
Depends on the option value
Element
Block NTLM when Machine binding fails
Options
ItemStored value
Audit1
Enabled2
Disabled0
Apply with .reg · CMD · PowerShell
.reg
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters]

; Options (use only one)
; Audit
"EnforceMachineBinding"=dword:00000001
; Enabled
"EnforceMachineBinding"=dword:00000002
; Disabled
"EnforceMachineBinding"=dword:00000000
CMD
:: Options (use only one)

:: Audit
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "EnforceMachineBinding" /t REG_DWORD /d 1 /f
:: Enabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "EnforceMachineBinding" /t REG_DWORD /d 2 /f
:: Disabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "EnforceMachineBinding" /t REG_DWORD /d 0 /f
PowerShell
# Common: create the key
New-Item -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Force | Out-Null

# Options (use only one)
# Audit
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'EnforceMachineBinding' -PropertyType DWord -Value 1 -Force | Out-Null
# Enabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'EnforceMachineBinding' -PropertyType DWord -Value 2 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'EnforceMachineBinding' -PropertyType DWord -Value 0 -Force | Out-Null

BlockAll

REG_DWORDComputer
HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters Current key
Enabled value
Depends on the option value
Element
Block all NTLM authentication
Options
ItemStored value
Audit1
Enabled2
Disabled0
Apply with .reg · CMD · PowerShell
.reg
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters]

; Options (use only one)
; Audit
"BlockAll"=dword:00000001
; Enabled
"BlockAll"=dword:00000002
; Disabled
"BlockAll"=dword:00000000
CMD
:: Options (use only one)

:: Audit
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "BlockAll" /t REG_DWORD /d 1 /f
:: Enabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "BlockAll" /t REG_DWORD /d 2 /f
:: Disabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "BlockAll" /t REG_DWORD /d 0 /f
PowerShell
# Common: create the key
New-Item -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Force | Out-Null

# Options (use only one)
# Audit
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'BlockAll' -PropertyType DWord -Value 1 -Force | Out-Null
# Enabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'BlockAll' -PropertyType DWord -Value 2 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'BlockAll' -PropertyType DWord -Value 0 -Force | Out-Null

EnhancedMachineBlockingAllowList

REG_MULTI_SZComputer
HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters Current key
Enabled value
Depends on the option value
Element
Specify the allow list for enhanced blocking policies:
Value type
REG_MULTI_SZ
Apply with .reg · CMD · PowerShell
.reg
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
; hex(2) and hex(7) data must be written as hexadecimal (UTF-16LE)
"EnhancedMachineBlockingAllowList"=hex(7):<enter value>
CMD
:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters" /v "EnhancedMachineBlockingAllowList" /t REG_MULTI_SZ /d "<enter value>" /f
PowerShell
# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\NTLM\Parameters' -Name 'EnhancedMachineBlockingAllowList' -PropertyType MultiString -Value '<enter value>' -Force | Out-Null