Configure SMB v1 client driver
Verified with Microsoft Security Baseline (MSS / SecGuide) 25H2 — updated on July 30, 2026
Supported on: At least Windows Server 2008 R2 or Windows 7
Path in the GPO console
Computer Configuration\Administrative Templates\MS Security Guide Description
Configures the SMB v1 client driver's start type. To disable client-side processing of the SMBv1 protocol, select the "Enabled" radio button, then select "Disable driver" from the dropdown. WARNING: DO NOT SELECT THE "DISABLED" RADIO BUTTON UNDER ANY CIRCUMSTANCES! For Windows 7 and Servers 2008, 2008R2, and 2012, you must also configure the "Configure SMB v1 client (extra setting needed for pre-Win8.1/2012R2)" setting. To restore default SMBv1 client-side behavior, select "Enabled" and choose the correct default from the dropdown: * "Manual start" for Windows 7 and Windows Servers 2008, 2008R2, and 2012; * "Automatic start" for Windows 8.1 and Windows Server 2012R2 and newer. Changes to this setting require a reboot to take effect. For more information, see https://support.microsoft.com/kb/2696547
Registry
SYSTEM\CurrentControlSet\Services\MrxSmb10 MDM / Intune (CSP)
./Device/Vendor/MSFT/Policy/Config/MSSecurityGuide/ConfigureSMBV1ClientDriver 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. ⓘ
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Configure SMB v1 client driver
; State: Enabled
; Supported on: At least Windows Server 2008 R2 or Windows 7
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MrxSmb10]
"Start"=dword:00000004More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Configure SMB v1 client driver
# State: Enabled
# Supported on: At least Windows Server 2008 R2 or Windows 7
$path = 'HKLM:\SYSTEM\CurrentControlSet\Services\MrxSmb10'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'Start' -Value 4 -Type DWordIntune XML
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/MSSecurityGuide/ConfigureSMBV1ClientDriver
Data type: String
Value:
<enabled/>
<data id="Pol_SecGuide_SMB1ClientDriver" value="4"/>Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Configure SMB v1 client driver
# State: Enabled
# Supported on: At least Windows Server 2008 R2 or Windows 7
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\SYSTEM\CurrentControlSet\Services\MrxSmb10' -Name 'Start' -Expected 4 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Configure SMB v1 client driver
# State: Enabled
# Supported on: At least Windows Server 2008 R2 or Windows 7
$path = 'HKLM:\SYSTEM\CurrentControlSet\Services\MrxSmb10'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'Start' -Value 4 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Configure SMB v1 client driver
# State: Enabled
# Supported on: At least Windows Server 2008 R2 or Windows 7
# 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: Configure SMB v1 client driver
# State: Enabled
# Supported on: At least Windows Server 2008 R2 or Windows 7
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\SYSTEM\CurrentControlSet\Services\MrxSmb10' -Name 'Start' -Expected 4 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Configure SMB v1 client driver
# State: Enabled
# Supported on: At least Windows Server 2008 R2 or Windows 7
$path = 'HKLM:\SYSTEM\CurrentControlSet\Services\MrxSmb10'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'Start' -Value 4 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.