Define interoperable Kerberos V5 realm settings
Verified with Windows 11 25H2 — updated on July 30, 2026
Supported on: At least Windows Vista
Path in the GPO console
Computer Configuration\Administrative Templates\System\Kerberos Description
This policy setting configures the Kerberos client so that it can authenticate with interoperable Kerberos V5 realms, as defined by this policy setting. If you enable this policy setting, you can view and change the list of interoperable Kerberos V5 realms and their settings. To view the list of interoperable Kerberos V5 realms, enable the policy setting and then click the Show button. To add an interoperable Kerberos V5 realm, enable the policy setting, note the syntax, and then click Show. In the Show Contents dialog box in the Value Name column, type the interoperable Kerberos V5 realm name. In the Value column, type the realm flags and host names of the host KDCs using the appropriate syntax format. To remove an interoperable Kerberos V5 realm Value Name or Value entry from the list, click the entry, and then press the DELETE key. To edit a mapping, remove the current entry from the list and add a new one with different parameters. If you disable this policy setting, the interoperable Kerberos V5 realm settings defined by Group Policy are deleted. If you do not configure this policy setting, the system uses the interoperable Kerberos V5 realm settings that are defined in the local registry, if they exist.
Registry
Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos Value name: MitRealms_Enabled
MDM / Intune (CSP)
./Device/Vendor/MSFT/Policy/Config/ADMX_Kerberos/MitRealms 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: Define interoperable Kerberos V5 realm settings
; State: Enabled
; Supported on: At least Windows Vista
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos]
"MitRealms_Enabled"=dword:00000001
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\MitRealms]
; List values: enter one value per line in the builder UI.More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Define interoperable Kerberos V5 realm settings
# State: Enabled
# Supported on: At least Windows Vista
$path = 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'MitRealms_Enabled' -Value 1 -Type DWord
$path = 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\MitRealms'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.Intune XML
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/ADMX_Kerberos/MitRealms
Data type: String
Value:
<enabled/>
<!-- MitRealms: enter one value per line before copying this XML payload. -->Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Define interoperable Kerberos V5 realm settings
# State: Enabled
# Supported on: At least Windows Vista
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\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\MitRealms: List values: enter one value per line in the builder UI.
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos' -Name 'MitRealms_Enabled' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Define interoperable Kerberos V5 realm settings
# State: Enabled
# Supported on: At least Windows Vista
$path = 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'MitRealms_Enabled' -Value 1 -Type DWord
$path = 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\MitRealms'
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: Define interoperable Kerberos V5 realm settings
# State: Enabled
# Supported on: At least Windows Vista
# 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: Define interoperable Kerberos V5 realm settings
# State: Enabled
# Supported on: At least Windows Vista
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\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\MitRealms: List values: enter one value per line in the builder UI.
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos' -Name 'MitRealms_Enabled' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Define interoperable Kerberos V5 realm settings
# State: Enabled
# Supported on: At least Windows Vista
$path = 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'MitRealms_Enabled' -Value 1 -Type DWord
$path = 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\MitRealms'
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.