Define Activation Security Check exemptions: registry value DCOMActivationSecurityCheckExemptionList (ActivationSecurityCheckExemptionList)ComputerHKLM\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat\ActivationSecurityCheckExemptionList

Policy ID: DCOMActivationSecurityCheckExemptionList
Scope: Computer Configuration
Supported on: At least Windows XP Professional with SP2
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: System › Distributed COM › Application Compatibility Settings

Registry

ListBox_Support_ActivationSecurityCheckExemptionList

REG_DWORDComputer

HKLM\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat

Enabled value: 1
Disabled value: 0

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat]

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

CMD

:: Options (use only one)

:: Enabled
reg add "HKLM\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat" /v "ListBox_Support_ActivationSecurityCheckExemptionList" /t REG_DWORD /d 1 /f
:: Disabled
reg add "HKLM\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat" /v "ListBox_Support_ActivationSecurityCheckExemptionList" /t REG_DWORD /d 0 /f

PowerShell

# Common: create the key
New-Item -Path 'HKLM:\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat' -Force | Out-Null

# Options (use only one)
# Enabled
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat' -Name 'ListBox_Support_ActivationSecurityCheckExemptionList' -PropertyType DWord -Value 1 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat' -Name 'ListBox_Support_ActivationSecurityCheckExemptionList' -PropertyType DWord -Value 0 -Force | Out-Null

(list values)

REG_SZComputer

HKLM\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat\ActivationSecurityCheckExemptionList Current key

Enabled value: Depends on the option value
Element: Add\remove DCOM servers to the exemption list:
Value type: REG_SZ
Add to existing value: true
Explicit value name: true

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat\ActivationSecurityCheckExemptionList]
"<enter name>"="<enter value>"

CMD

reg add "HKLM\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat\ActivationSecurityCheckExemptionList" /v "<enter name>" /t REG_SZ /d "<enter value>" /f

PowerShell

New-Item -Path 'HKLM:\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat\ActivationSecurityCheckExemptionList' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows NT\DCOM\AppCompat\ActivationSecurityCheckExemptionList' -Name '<enter name>' -PropertyType String -Value '<enter value>' -Force | Out-Null