Specify SHA1 thumbprints of certificates representing trusted .rdp publishers
Verified with Windows 11 25H2 — updated on July 30, 2026
Supported on: At least Windows Vista with Service Pack 1
Path in the GPO console
Computer Configuration\Administrative Templates\Windows Components\Remote Desktop Services\Remote Desktop Connection Client Description
This policy setting allows you to specify a list of Secure Hash Algorithm 1 (SHA1) certificate thumbprints that represent trusted Remote Desktop Protocol (.rdp) file publishers. If you enable this policy setting, any certificate with an SHA1 thumbprint that matches a thumbprint on the list is trusted. If a user tries to start an .rdp file that is signed by a trusted certificate, the user does not receive any warning messages when they start the file. To obtain the thumbprint, view the certificate details, and then click the Thumbprint field. If you disable or do not configure this policy setting, no publisher is treated as a trusted .rdp publisher. Notes: You can define this policy setting in the Computer Configuration node or in the User Configuration node. If you configure this policy setting for the computer, the list of certificate thumbprints trusted for a user is a combination of the list defined for the computer and the list defined for the user. This policy setting overrides the behavior of the "Allow .rdp files from valid publishers and user's default .rdp settings" policy setting. If the list contains a string that is not a certificate thumbprint, it is ignored.
Registry
SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services MDM / Intune (CSP)
./Device/Vendor/MSFT/Policy/Config/ADMX_TerminalServer/TS_CLIENT_TRUSTED_CERTIFICATE_THUMBPRINTS_1 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: Specify SHA1 thumbprints of certificates representing trusted .rdp publishers
; State: Enabled
; Supported on: At least Windows Vista with Service Pack 1
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services]
"TrustedCertThumbprints"=""More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Specify SHA1 thumbprints of certificates representing trusted .rdp publishers
# State: Enabled
# Supported on: At least Windows Vista with Service Pack 1
$path = 'HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'TrustedCertThumbprints' -Value '' -Type StringIntune XML
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/ADMX_TerminalServer/TS_CLIENT_TRUSTED_CERTIFICATE_THUMBPRINTS_1
Data type: String
Value:
<enabled/>
<data id="TRUSTED_CERTIFICATE_THUMBPRINTS" value=""/>Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Specify SHA1 thumbprints of certificates representing trusted .rdp publishers
# State: Enabled
# Supported on: At least Windows Vista with Service Pack 1
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services' -Name 'TrustedCertThumbprints' -Expected '' -Kind String)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Specify SHA1 thumbprints of certificates representing trusted .rdp publishers
# State: Enabled
# Supported on: At least Windows Vista with Service Pack 1
$path = 'HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'TrustedCertThumbprints' -Value '' -Type StringSCCM scripts
# Exported from gporais.com
# Policy: Specify SHA1 thumbprints of certificates representing trusted .rdp publishers
# State: Enabled
# Supported on: At least Windows Vista with Service Pack 1
# 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: Specify SHA1 thumbprints of certificates representing trusted .rdp publishers
# State: Enabled
# Supported on: At least Windows Vista with Service Pack 1
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services' -Name 'TrustedCertThumbprints' -Expected '' -Kind String)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Specify SHA1 thumbprints of certificates representing trusted .rdp publishers
# State: Enabled
# Supported on: At least Windows Vista with Service Pack 1
$path = 'HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'TrustedCertThumbprints' -Value '' -Type StringBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.