Automatically grant sites permission to connect all serial ports
Verified with Microsoft Edge 152.0.4191.53 — updated on July 10, 2026
Supported on: Microsoft Edge version 97, Windows 7 or later
Path in the GPO console
Computer Configuration\Administrative Templates\Microsoft Edge\Content settings User Configuration\Administrative Templates\Microsoft Edge\Content settings Description
Setting the policy allows you to list sites that are automatically granted permission to access all available serial ports. The URLs must be valid; else, the policy is ignored. Only the origin (scheme, host, and port) of the URL is considered. This policy overrides 'DefaultSerialGuardSetting' (Control use of the Serial API), 'SerialAskForUrls' (Allow the Serial API on specific sites), 'SerialBlockedForUrls' (Block the Serial API on specific sites), and the user's preferences. Example value: https://www.example.com
Registry
HKLM
Software\Policies\Microsoft\Edge HKCU
Software\Policies\Microsoft\Edge 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: Automatically grant sites permission to connect all serial ports
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: Microsoft Edge version 97, Windows 7 or later
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Edge\SerialAllowAllPortsForUrls]
; List values: enter one value per line in the builder UI.More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Automatically grant sites permission to connect all serial ports
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 97, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge\SerialAllowAllPortsForUrls'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.Intune 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: Automatically grant sites permission to connect all serial ports
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 97, Windows 7 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
}
# HKLM:\Software\Policies\Microsoft\Edge\SerialAllowAllPortsForUrls: List values: enter one value per line in the builder UI.
# No testable registry values are available for this state.
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Automatically grant sites permission to connect all serial ports
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 97, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge\SerialAllowAllPortsForUrls'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.SCCM scripts
# Exported from gporais.com
# Policy: Automatically grant sites permission to connect all serial ports
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 97, Windows 7 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: Automatically grant sites permission to connect all serial ports
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 97, Windows 7 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
}
# HKLM:\Software\Policies\Microsoft\Edge\SerialAllowAllPortsForUrls: List values: enter one value per line in the builder UI.
# No testable registry values are available for this state.
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Automatically grant sites permission to connect all serial ports
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 97, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge\SerialAllowAllPortsForUrls'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.Building a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.