Use lowercase DNS host names when registering domain controller SRV records
Verified with Windows 11 25H2 — updated on July 30, 2026
Supported on: At least Windows Server 2008
Path in the GPO console
Computer Configuration\Administrative Templates\System\Net Logon\DC Locator DNS Records Description
This policy setting configures whether the domain controllers to which this setting is applied will lowercase their DNS host name when registering SRV records. If enabled, domain controllers will lowercase their DNS host name when registering domain controller SRV records. A best-effort attempt will be made to delete any previously registered SRV records that contain mixed-case DNS host names. For more information and potential manual cleanup procedures, see the link below. If disabled, domain controllers will use their configured DNS host name as-is when registering domain controller SRV records. If not configured, domain controllers will default to using their local configuration. The default local configuration is enabled. A reboot is not required for changes to this setting to take effect. More information is available at https://aka.ms/lowercasehostnamesrvrecord
Registry
Software\Policies\Microsoft\Netlogon\Parameters Value name: DnsSrvRecordUseLowerCaseHostNames
Enabled: DnsSrvRecordUseLowerCaseHostNames = 1
Disabled: DnsSrvRecordUseLowerCaseHostNames = 0
MDM / Intune (CSP)
./Device/Vendor/MSFT/Policy/Config/ADMX_Netlogon/Netlogon_DnsSrvRecordUseLowerCaseHostNames 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: Use lowercase DNS host names when registering domain controller SRV records
; State: Enabled
; Supported on: At least Windows Server 2008
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Netlogon\Parameters]
"DnsSrvRecordUseLowerCaseHostNames"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Use lowercase DNS host names when registering domain controller SRV records
# State: Enabled
# Supported on: At least Windows Server 2008
$path = 'HKLM:\Software\Policies\Microsoft\Netlogon\Parameters'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'DnsSrvRecordUseLowerCaseHostNames' -Value 1 -Type DWordIntune XML
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/ADMX_Netlogon/Netlogon_DnsSrvRecordUseLowerCaseHostNames
Data type: String
Value:
<enabled/>Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Use lowercase DNS host names when registering domain controller SRV records
# State: Enabled
# Supported on: At least Windows Server 2008
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Netlogon\Parameters' -Name 'DnsSrvRecordUseLowerCaseHostNames' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Use lowercase DNS host names when registering domain controller SRV records
# State: Enabled
# Supported on: At least Windows Server 2008
$path = 'HKLM:\Software\Policies\Microsoft\Netlogon\Parameters'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'DnsSrvRecordUseLowerCaseHostNames' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Use lowercase DNS host names when registering domain controller SRV records
# State: Enabled
# Supported on: At least Windows Server 2008
# 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: Use lowercase DNS host names when registering domain controller SRV records
# State: Enabled
# Supported on: At least Windows Server 2008
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Netlogon\Parameters' -Name 'DnsSrvRecordUseLowerCaseHostNames' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Use lowercase DNS host names when registering domain controller SRV records
# State: Enabled
# Supported on: At least Windows Server 2008
$path = 'HKLM:\Software\Policies\Microsoft\Netlogon\Parameters'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'DnsSrvRecordUseLowerCaseHostNames' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.