Allow only approved domains to use the TDC ActiveX control
Verified with Windows 11 25H2 — updated on July 23, 2026
Supported on: At least Internet Explorer 11.0 on Windows 10, vertion 1607 or later
Path in the GPO console
Computer Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel\Security Page\Locked-Down Intranet Zone User Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel\Security Page\Locked-Down Intranet Zone Description
This policy setting controls whether or not the user is allowed to run the TDC ActiveX control on websites. If you enable this policy setting, the TDC ActiveX control will not run from websites in this zone. If you disable this policy setting, the TDC Active X control will run from all sites in this zone.
Registry
HKLM
Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\1 HKCU
Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\1 Export Builder
BETAConfigure the state, scope and options, then generate .reg, PowerShell, Intune and SCCM outputs — or add the setting to a multi-setting collection.
These exports write the registry — this is not a managed GPO. ⓘ
Applying both scopes creates an ambiguous configuration (computer takes precedence over user). Only do this intentionally.
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Allow only approved domains to use the TDC ActiveX control
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: At least Internet Explorer 11.0 on Windows 10, vertion 1607 or later
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\1]
"120c"=dword:00000003More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Allow only approved domains to use the TDC ActiveX control
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 11.0 on Windows 10, vertion 1607 or later
$path = 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\1'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name '120c' -Value 3 -Type DWordIntune XML
No direct Policy CSP / OMA-URI mapping for this policy. Use the Intune Remediation tab, or ingest the ADMX in Intune.Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Allow only approved domains to use the TDC ActiveX control
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 11.0 on Windows 10, vertion 1607 or later
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\1' -Name '120c' -Expected 3 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Allow only approved domains to use the TDC ActiveX control
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 11.0 on Windows 10, vertion 1607 or later
$path = 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\1'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name '120c' -Value 3 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Allow only approved domains to use the TDC ActiveX control
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 11.0 on Windows 10, vertion 1607 or later
# SCCM Configuration Item guidance:
# Create a Configuration Item of type "Setting: Script".
# Discovery script: use the Detection script below.
# Remediation script: use the Remediation script below.
# Compliance rule: the Discovery script output equals 'Compliant'.
# === Detection script ===
# Exported from gporais.com
# Policy: Allow only approved domains to use the TDC ActiveX control
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 11.0 on Windows 10, vertion 1607 or later
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\1' -Name '120c' -Expected 3 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Allow only approved domains to use the TDC ActiveX control
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 11.0 on Windows 10, vertion 1607 or later
$path = 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\1'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name '120c' -Value 3 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.