How to suppress the "Unverified Publisher" Security Warnings
How to suppress the "Unverified Publisher" Security Warnings
Applies to: Windows 10, Windows 11, Windows Server 2012 through Windows Server 2025
Users options
Summary
The April 2026 Windows security update (CVE-2026-26151) introduces new security dialogs in the Remote Desktop Connection client when users open .rdp files. These dialogs appear before any connection is established and affect all RDP file-based connections, including TruGrid SecureRDP sessions.
What Users Will See
First launch dialog (one time): After installing the update, the first .rdp file opened on a user account triggers an educational dialog about RDP file risks. The user must select "Allow" to proceed. This dialog does not appear again.
Connection security dialog (every connection):
Each .rdp file launch displays a dialog showing the remote computer address, publisher identity, and a checklist of requested local resource redirections (clipboard, drives, printers, etc.). All redirections are disabled by default and must be explicitly enabled before connecting.
Unsigned .rdp files display a "Caution: Unknown remote connection" banner. Signed files show the publisher name with a prompt to verify:
What Users Should Do
- Select "Allow" on the first-launch dialog to enable RDP file connections.
- Verify the remote computer address on the connection dialog.
- Enable only the redirections needed for the session.
- Click "Remember my choices for remote connections from this publisher"
- Select "Connect" to proceed.
If an .rdp file is unexpected or unrecognized, do not open it. Contact your IT administrator or TruGrid support.
Administrator Options
Suppress the First Launch Dialog
Path: HKCU\Software\Microsoft\Terminal Server Client
Name | Type | Value |
|---|---|---|
RdpLaunchConsentAccepted | REG_DWORD | 1 |
Deployable via Group Policy Preferences or a manual Registry update.
PowerShell Deployment
Suppress first-launch dialog (per-user, run in user context)
This suppresses the one-time "Remote Desktop Connection files can harm your device" educational dialog that appears the first time a user opens any .rdp file after the April 2026 update. Setting this value pre-acknowledges the dialog on behalf of the user, so it never appears. Without this fix, each user must manually select "Allow" before any .rdp connection can proceed.
New-ItemProperty -Path "HKCU:\Software\Microsoft\Terminal Server Client"
` -Name "RdpLaunchConsentAccepted" -Value 1 -PropertyType DWord -Force
Revert connection dialog (per-machine, run elevated)
This reverts the new "Caution: Unknown remote connection" dialog that appears on every .rdp file launch. That dialog requires users to manually enable each resource redirection (clipboard, drives, printers, etc.) before connecting. Setting this value restores the previous connection behavior where the .rdp file settings, including redirections configured in the TruGrid admin panel, are respected automatically without additional user interaction.
New-Item -Path "HKLM:\Software\Policies\Microsoft\Windows NT\Terminal Services\Client" -Force
New-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows NT\Terminal Services\Client" `
-Name "RedirectionWarningDialogVersion" -Value 1 -PropertyType DWord -Force
Group policy Deployment
Suppress the First Launch Dialog (per-user):
- Open Group Policy Management and edit the target GPO.
- Navigate to User Configuration > Preferences > Windows Settings > Registry.
- Create a new Registry Item with the following values:
Field | Value |
|---|---|
Action | Update |
Hive | HKEY_CURRENT_USER |
Key Path | Software\Microsoft\Terminal Server Client |
Value name | RdpLaunchConsentAccepted |
Value type | REG_DWORD |
Value data | 1 |
Run gpupdate /force on target machines or wait for the next Group Policy refresh cycle. Verify deployment with gpresult /h report.html or by checking the registry values directly.
Note: The RedirectionWarningDialogVersion setting sits under the Policies hive, so it behaves as a policy-enforced value and takes precedence over any local configuration. Microsoft may remove support for this setting in a future update.
Related Information
- Microsoft documentation: Understanding security warnings when opening RDP files
- CVE-2026-26151 (CVSS 7.1, rated Important)
- Windows 10: KB5082200 | Windows 11: KB5083769
Contact Support
If you experience issues with RDP connections after applying the April 2026 update, contact TruGrid support for assistance.
Updated on: 15/04/2026
Thank you!