Turn on certificate address mismatch warning
Verified with Windows 11 25H2 — updated on July 30, 2026
Supported on: At least Internet Explorer 8.0
Path in the GPO console
Computer Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel\Security Page User Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel\Security Page Description
This policy setting allows you to turn on the certificate address mismatch security warning. When this policy setting is turned on, the user is warned when visiting Secure HTTP (HTTPS) websites that present certificates issued for a different website address. This warning helps prevent spoofing attacks. If you enable this policy setting, the certificate address mismatch warning always appears. If you disable or do not configure this policy setting, the user can choose whether the certificate address mismatch warning appears (by using the Advanced page in the Internet Control panel).
Registry
HKLM
Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings HKCU
Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings Value name: WarnOnBadCertRecving
Enabled: WarnOnBadCertRecving = 1
MDM / Intune (CSP)
Device
./Device/Vendor/MSFT/Policy/Config/InternetExplorer/AllowCertificateAddressMismatchWarning User
./User/Vendor/MSFT/Policy/Config/InternetExplorer/AllowCertificateAddressMismatchWarning Microsoft Learn documentation Mapping data: Microsoft Learn (CC BY 4.0)
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: Turn on certificate address mismatch warning
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: At least Internet Explorer 8.0
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings]
"WarnOnBadCertRecving"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Turn on certificate address mismatch warning
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 8.0
$path = 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'WarnOnBadCertRecving' -Value 1 -Type DWordIntune XML
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/InternetExplorer/AllowCertificateAddressMismatchWarning
Data type: String
Value:
<enabled/>Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Turn on certificate address mismatch warning
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 8.0
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings' -Name 'WarnOnBadCertRecving' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Turn on certificate address mismatch warning
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 8.0
$path = 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'WarnOnBadCertRecving' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Turn on certificate address mismatch warning
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 8.0
# 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: Turn on certificate address mismatch warning
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 8.0
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings' -Name 'WarnOnBadCertRecving' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Turn on certificate address mismatch warning
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 8.0
$path = 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'WarnOnBadCertRecving' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.