Disabled SMB over QUIC Server Exception List

ComputerIntune-readyNew in 25H2 · 1.0Pol_DisabledSMBQUICServerExceptionList

Supported on At least Windows Server 2025, Windows 11

25H2 · 1.0

What it does

This policy setting specifies the servers the SMB client can connect to over QUIC. If you enable this policy setting (valid only if SMB over QUIC is disabled), the SMB client can connect to the specified servers over QUIC. Please enter the desired servers (DNS name, IP address or NetBIOS name) in the edit box, one server name per line. If you disable or do not configure this policy setting, the SMB client's ability to connect to servers over QUIC will be determined by other settings.

What it writes

Hive: HKEY_LOCAL_MACHINE
Registry key: Software\Policies\Microsoft\Windows\LanmanWorkstation

In Intune

No native CSP; import the ADMX (Intune-ready).

From Microsoft's Policy CSP DDF files (DDF v2 Files, February 2026), read 18 Oct 2026.

Options

Option	Type	Registry value	Allowed values
Disabled SMB over QUIC Server Exception List	Multi-line text	`DisabledSMBQUICServerExceptionList`	Any

Configure and deploy

Choose a state and the option values; the output below is generated from the template for exactly that.

Enabled · Computer · template defaults

Registry file (.reg)

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LanmanWorkstation]
"DisabledSMBQUICServerExceptionList"=hex(7):00,00,00,00

PowerShell

$ErrorActionPreference = 'Stop'

function Set-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $PropertyType,
        [Parameter(Mandatory = $true)][object] $Value
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        New-Item -Path $Path -Force | Out-Null
    }

    New-ItemProperty -LiteralPath $Path -Name $Name -PropertyType $PropertyType -Value $Value -Force | Out-Null
}

function Remove-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (Test-Path -LiteralPath $Path) {
        Remove-ItemProperty -LiteralPath $Path -Name $Name -Force -ErrorAction SilentlyContinue
    }
}

function Clear-RegistryKeyValues {
    param(
        [Parameter(Mandatory = $true)][string] $Path
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return
    }

    foreach ($propertyName in (Get-Item -LiteralPath $Path).Property) {
        Remove-ItemProperty -LiteralPath $Path -Name $propertyName -Force -ErrorAction SilentlyContinue
    }
}

# Policy: Disabled SMB over QUIC Server Exception List
# Name: Pol_DisabledSMBQUICServerExceptionList
# Scope: Machine
# State: Enabled
# Source: LanmanWorkstation.admx

Set-RegistryValue -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LanmanWorkstation' -Name 'DisabledSMBQUICServerExceptionList' -PropertyType 'MultiString' -Value @()

The OMA-URI is an inferred ADMX-backed Policy CSP candidate derived from the source ADMX file name and policy name.
Some Microsoft policies use built-in Policy CSP pages whose area names don't match the ADMX file name, so verify the candidate against Microsoft Learn before deployment.
The generated payload is incomplete because one or more ADMX element values were not supplied: MultiText_DisabledSMBQUICServerExceptionList

ADMX profile candidate (OMA-URI)

./Device/Vendor/MSFT/Policy/Config/ADMX_LanmanWorkstation/Pol_DisabledSMBQUICServerExceptionList

Intune remediation scripts

Detection

$ErrorActionPreference = 'Stop'
$reasons = [System.Collections.Generic.List[string]]::new()

function Test-RegistryValueExists {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return $false
    }

    return $null -ne (Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction SilentlyContinue)
}

function Test-RegistryValueEquals {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $Kind,
        [Parameter(Mandatory = $true)][object] $Expected
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return $false
    }

    $valueObject = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction SilentlyContinue
    if ($null -eq $valueObject) {
        return $false
    }

    $actual = $valueObject.$Name
    switch ($Kind) {
        'String' { return [string]$actual -ceq [string]$Expected }
        'ExpandString' { return [string]$actual -ceq [string]$Expected }
        'DWord' { return [uint32]$actual -eq [uint32]$Expected }
        'QWord' { return [uint64]$actual -eq [uint64]$Expected }
        'MultiString' {
            $actualArray = @($actual)
            $expectedArray = @($Expected)
            if ($actualArray.Count -ne $expectedArray.Count) { return $false }
            for ($index = 0; $index -lt $actualArray.Count; $index++) {
                if ([string]$actualArray[$index] -cne [string]$expectedArray[$index]) { return $false }
            }
            return $true
        }
        'Binary' {
            $actualArray = [byte[]]$actual
            $expectedArray = [byte[]]$Expected
            if ($actualArray.Length -ne $expectedArray.Length) { return $false }
            for ($index = 0; $index -lt $actualArray.Length; $index++) {
                if ($actualArray[$index] -ne $expectedArray[$index]) { return $false }
            }
            return $true
        }
        default { return [string]$actual -ceq [string]$Expected }
    }
}

# Policy: Disabled SMB over QUIC Server Exception List
# Name: Pol_DisabledSMBQUICServerExceptionList
# Scope: Machine
# State: Enabled
# Source: LanmanWorkstation.admx

$isMatch = Test-RegistryValueEquals -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LanmanWorkstation' -Name 'DisabledSMBQUICServerExceptionList' -Kind 'MultiString' -Expected @()
if (-not $isMatch) {
    $reasons.Add('Value mismatch: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LanmanWorkstation\DisabledSMBQUICServerExceptionList') | Out-Null
}

if ($reasons.Count -eq 0) {
    Write-Output 'Compliant'
    exit 0
}

$reasons | ForEach-Object { Write-Output $_ }
exit 1

Remediation

$ErrorActionPreference = 'Stop'

function Set-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $PropertyType,
        [Parameter(Mandatory = $true)][object] $Value
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        New-Item -Path $Path -Force | Out-Null
    }

    New-ItemProperty -LiteralPath $Path -Name $Name -PropertyType $PropertyType -Value $Value -Force | Out-Null
}

function Remove-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (Test-Path -LiteralPath $Path) {
        Remove-ItemProperty -LiteralPath $Path -Name $Name -Force -ErrorAction SilentlyContinue
    }
}

function Clear-RegistryKeyValues {
    param(
        [Parameter(Mandatory = $true)][string] $Path
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return
    }

    foreach ($propertyName in (Get-Item -LiteralPath $Path).Property) {
        Remove-ItemProperty -LiteralPath $Path -Name $propertyName -Force -ErrorAction SilentlyContinue
    }
}

# Policy: Disabled SMB over QUIC Server Exception List
# Name: Pol_DisabledSMBQUICServerExceptionList
# Scope: Machine
# State: Enabled
# Source: LanmanWorkstation.admx

Set-RegistryValue -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LanmanWorkstation' -Name 'DisabledSMBQUICServerExceptionList' -PropertyType 'MultiString' -Value @()

History 5 retained releases

25H2 · 1.029 Sep 2025
- Added in this release.

Template

Internal name: Pol_DisabledSMBQUICServerExceptionList
Namespace: Microsoft.Policies.LanmanWorkstation
Template file: LanmanWorkstation.admx
Release: Windows 11 25H2 · 1.0 · file set de4e49983ebd651f…

Definition, editor controls and support

Definition

<policy class="Machine" displayName="$(string.Pol_DisabledSMBQUICServerExceptionList_Name)" explainText="$(string.Pol_DisabledSMBQUICServerExceptionList_Help)" key="Software\Policies\Microsoft\Windows\LanmanWorkstation" name="Pol_DisabledSMBQUICServerExceptionList" presentation="$(presentation.Pol_DisabledSMBQUICServerExceptionList)" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="Microsoft.Policies.LanmanWorkstation:Cat_LanmanWorkstation" />
      <supportedOn ref="Microsoft.Policies.LanmanWorkstation:SUPPORTED_Windows_Server_2025_Windows_11_0" />
      <elements>
        <multiText id="MultiText_DisabledSMBQUICServerExceptionList" valueName="DisabledSMBQUICServerExceptionList" />
      </elements>
    </policy>

Editor controls

<presentation id="Pol_DisabledSMBQUICServerExceptionList" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
        <text>Disabled SMB over QUIC Server Exception List:</text>
        <multiTextBox refId="MultiText_DisabledSMBQUICServerExceptionList" />
      </presentation>

Supported platforms and category

Microsoft.Policies.LanmanWorkstation:category:Cat_LanmanWorkstation
<category displayName="$(string.Cat_LanmanWorkstation)" name="Cat_LanmanWorkstation" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="Microsoft.Policies.Windows:Network" />
    </category>
Microsoft.Policies.LanmanWorkstation:definition:SUPPORTED_Windows_Server_2025_Windows_11_0
<definition displayName="$(string.SUPPORTED_Windows_Server_2025_Windows_11_0)" name="SUPPORTED_Windows_Server_2025_Windows_11_0" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      </definition>
Microsoft.Policies.Windows:category:Network
<category displayName="$(string.Network)" explainText="$(string.Network_Help)" name="Network" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
Microsoft.Policies.LanmanWorkstation:category:Cat_LanmanWorkstation
<category displayName="$(string.Cat_LanmanWorkstation)" name="Cat_LanmanWorkstation" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="Microsoft.Policies.Windows:Network" />
    </category>
<strings><string id="Microsoft.Policies.LanmanWorkstation:Cat_LanmanWorkstation">Lanman Workstation</string></strings>
Microsoft.Policies.LanmanWorkstation:definition:SUPPORTED_Windows_Server_2025_Windows_11_0
<definition displayName="$(string.SUPPORTED_Windows_Server_2025_Windows_11_0)" name="SUPPORTED_Windows_Server_2025_Windows_11_0" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      </definition>
<strings><string id="Microsoft.Policies.LanmanWorkstation:SUPPORTED_Windows_Server_2025_Windows_11_0">At least Windows Server 2025, Windows 11</string></strings>
Microsoft.Policies.Windows:category:Network
<category displayName="$(string.Network)" explainText="$(string.Network_Help)" name="Network" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
<strings><string id="Microsoft.Policies.Windows:Network">Network</string><string id="Microsoft.Policies.Windows:Network_Help">Allows configuration of components of the operating system used by a client computer to connect to a network. This includes DNS settings and Offline Files.</string></strings>