Set authentication rate limiter delay (milliseconds)
Verified with Windows 11 25H2 — updated on July 30, 2026
Supported on: At least Windows Server 2025, Windows 11 24H2
Path in the GPO console
Computer Configuration\Administrative Templates\Network\Lanman Server Description
This policy controls whether the SMB server will use a default value in milliseconds for the invalid authentication delay. If you configure this policy setting, the authentication rate limiter will use the specified value for delaying invalid authentication attempts. If you do not configure this policy setting, the authentication rate limiter will use the default value or the value from local registry under HKLM\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters.
Registry
HKLM
Software\Policies\Microsoft\Windows\LanmanServer MDM / Intune (CSP)
./Device/Vendor/MSFT/Policy/Config/LanmanServer/AuthRateLimiterDelayInMs 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: Set authentication rate limiter delay (milliseconds)
; State: Enabled
; Supported on: At least Windows Server 2025, Windows 11 24H2
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LanmanServer]
"InvalidAuthenticationDelayTimeInMs"=dword:00000000More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Set authentication rate limiter delay (milliseconds)
# State: Enabled
# Supported on: At least Windows Server 2025, Windows 11 24H2
$path = 'HKLM:\Software\Policies\Microsoft\Windows\LanmanServer'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'InvalidAuthenticationDelayTimeInMs' -Value 0 -Type DWordIntune XML
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/LanmanServer/AuthRateLimiterDelayInMs
Data type: String
Value:
<enabled/>
<data id="DecimalTextBox_AuthRateLimiterDelayInMs" value="0"/>Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Set authentication rate limiter delay (milliseconds)
# State: Enabled
# Supported on: At least Windows Server 2025, Windows 11 24H2
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows\LanmanServer' -Name 'InvalidAuthenticationDelayTimeInMs' -Expected 0 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Set authentication rate limiter delay (milliseconds)
# State: Enabled
# Supported on: At least Windows Server 2025, Windows 11 24H2
$path = 'HKLM:\Software\Policies\Microsoft\Windows\LanmanServer'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'InvalidAuthenticationDelayTimeInMs' -Value 0 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Set authentication rate limiter delay (milliseconds)
# State: Enabled
# Supported on: At least Windows Server 2025, Windows 11 24H2
# 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: Set authentication rate limiter delay (milliseconds)
# State: Enabled
# Supported on: At least Windows Server 2025, Windows 11 24H2
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows\LanmanServer' -Name 'InvalidAuthenticationDelayTimeInMs' -Expected 0 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Set authentication rate limiter delay (milliseconds)
# State: Enabled
# Supported on: At least Windows Server 2025, Windows 11 24H2
$path = 'HKLM:\Software\Policies\Microsoft\Windows\LanmanServer'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'InvalidAuthenticationDelayTimeInMs' -Value 0 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.