How to Fix Remote Desktop Authentication Error on Windows 11

The Remote Desktop allows you to connect and access two computers remotely. Facing the authentication error when using the remote desktop can be disturbing as it will prevent you from accessing the other computer. Remote Desktop Authentication error is encountered with the error message-

‘An authentication error has occurred. The function request is not supported.’ 

Issues like such are common with Windows, and it’s not a big deal if you encounter the Remote Desktop authentication error on Windows 11. This article will guide you with different ways to help fix this issue 

Fix Remote Desktop Authentication Error on Windows 11

Knowing the root cause of the issues makes it much easier to fix. If your PC prompts you with Remote Desktop Authentication Error, the possible reasons can be invalid login details, remote desktop services not running, antivirus or other third-party antivirus software, etc.

Given below are various troubleshooting steps to help fix the Remote Desktop Authentication error on Windows 11-

1. Ensure Remote Desktop is Enabled

Generally, users forget to turn on the Remote Desktop feature on their PC and then encounter such an issue. To turn on the remote desktop on Windows 11, you can follow the steps given below-

1. Use the Windows + I keyboard shortcut to open Windows 11 Settings.
2. Under the System tab on the left sidebar, click on Remote Desktop.
3. Now, enable the toggle for Remote Desktop and then click on Confirm to turn on Remote Desktop.

2. Ensure you are Entering the Correct Credentials

This issue can be encountered if you use invalid remote desktop account credentials. Just check the credentials to see whether they are correct or not. If you have been trying to use the incorrect credentials, use the correct ones.

3. Rollback Windows Update

If you started facing this issue after installing a Windows update recently, that might be the real culprit. Uninstalling the recently installed update should help fix the Remote Desktop Authentication error on Windows 11. You can do so through the steps mentioned below-

1. Open the Settings app on Windows PC. 
2. Click on Windows Update on the left pane. 
3. Now, click on Update History, scroll down, and then click on Uninstall Updates.
4. Look for the recently installed update and click on Uninstall button next to it; click on Uninstall again to confirm uninstalling the update.
5. Now reboot your PC to apply the changes. 

4. Turn Off Windows Firewall

You might face this issue due to the Firewall on your PC. Try turning the Windows Firewall off and see if the issue is still encountered or not. 

1. Open the Start Menu and search for Windows Defender Firewall; click on the relevant option from the search result. 
2. On the left pane, click on Turn Windows Defender Firewall on or off.
3. Check the checkbox for Turn off Windows Defender Firewall (not recommended) for both Private network settings and Public network settings. 
4. Click on OK to save the changes and then close the Control Panel. 

Note- If you have any third-party antivirus on your PC, then Firewall settings will be managed by it. You will have to disable the firewall from the third-party antivirus if you are using one. 

5. Make Changes to the Registry 

You can edit the Registry on your PC, which should fix the issue. To do so, follow the steps given below-

1. Open the Registry Editor from the Start Menu.
2. Head to the following location here- 

   • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters

3. Here, double-click on AllowEncryptionOracle to edit it. 
4. Now, set the Value Data to 2 and then click on OK. 

Note– If AllowEncryptionOracle is unavailable, right-click on the empty space on the right, click New, and then DWORD (32-bit) Value. Name the new DWORD as AllowEncryptionOracle. 

6. Enable Encryption Oracle Remediation

If encryption oracle remediation is turned off, then that may also cause the Remote Desktop Authentication error in Windows 11. You can enable it through Group Policy Editor by following the steps given below-

1. Press Windows + R key combo, type gpedit.msc, and press Enter.
2. Navigate to the following address from the left pane-

   • Computer Configuration>Administrative Templates>System>Credentials Delegation

3. On the right side, double-click on Encryption Oracle Remediation to edit it.
4. Select Enabled, click on Apply, and then on OK.
5. Press the Windows key, type Command Prompt and open it. 
6. Here, execute the command

   • gpupdate /force

7. Close Command Prompt and then restart your PC. 

7. Disable Network Level Authentication on RDP Server

Another reason for facing this issue is network-level authentication enabled on the RDP server. Try turning it off when using Remote Desktop; you will no longer encounter the issue. 

1. Open the Run dialog using Windows + R. Type sysdm.cpl and press Enter.
2. Click on the Remote tab here. 
3. Select Allow remote connections to this computer and uncheck the option for Allow connections only from computers running Remote Desktop with Network Level Authentication (recommended).
4. Click on Apply button and then on OK. 
5. Now restart your PC to apply the changes to your system. 

Final Words

If you keep facing an authentication error when using the remote desktop, this article should help you. Upon successfully following the methods mentioned above, you should no longer encounter the Remote Desktop Authentication error on Windows 11. If you face difficulty with either of the steps, then let us know through the comments section.