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Occasionally, Windows 11 may be unable to remotely connect to another computer. This error message from Remote Desktop is among the most common ones: “An authentication error has occurred. The requested function is not supported. CredSSP encryption oracle remediation may be to blame for this. Typically, this error message appears out of nowhere. Unfortunately, trying to create a new remote connection frequently ends in failure. You are not alone if you try to use Remote Desktop software on your Windows 11 desktop computer but get an authentication error.
The message “An Authentication Error has Occurred, The Function Requested Is Not Supported” is one of the most typical errors. What, however, is the root of this authentication problem? This error can be caused by problems with the Remote Desktop Protocol (RDP) file configuration, incorrect login credentials, network connectivity issues, Remote Desktop services not running, Remote Desktop disabled, security software blocking Remote Desktop, etc. We mentioned below are the ways to Remote Desktop Authentication Error on Windows.
Ways to Remote Desktop Authentication Error on Windows
Enable Encryption Oracle Remediation
- In Windows 10 Pro and Enterprise, you can open the Group Policy Editor by typing gpedit.msc in the Run window.
- On the left side of the Group Policy Editor window, click Configure Computers.
- Next, on the left side of the window, select Administrative Templates > System > Delegate Credentials.
- Then click on Encrypted Oracle Remediation on the right side to open a window with its settings.
- Select the Enable radio button.
- Next, select the Vulnerability option from the Protection drop-down menu.
- Click the Apply button.
- To immediately activate the new group policy settings, open a command prompt by typing cmd in the Run
- Open a command prompt by typing cmd. In the prompt window, type gpupdate /force and press Enter.
Edit the Registry
- To do so, type regedit in the “Run” window and press the Return key to open the Registry Editor.
- Next, open this key in Registry Editor:
- HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionPoliciesSystemCredSSPParameters
- Double-click AllowEncryptionOracle DWORD to open its edit DWORD window.
- Enter the value “2” in the Value data text box and press the OK button.
- If you do not see the AllowEncryptionOracle DWORD, right-click on an empty space on the right side of the Registry Editor window and select New > DWORD to set a new DWORD. AllowEncryptionOracle”.
Adjust the Remote Desktop Settings
- Press the Windows key + R hotkey.
- Type sysdm.cpl in Run’s Open text box and click OK to open the window.
- Next, select the Remote tab.
- On the Remote tab, deselect the “Only allow connections from computers running Remote Desktop with network-level authentication (recommended)” option.
- Deselect the Network Level Authentication with Network Level Authentication (Recommended) option on the Remote tab.
- Press the Apply and OK buttons.
Perform an in-place upgrade
- Download and run the Media Creation Tool from the Microsoft website.
- Select Upgrade this PC now and click Next.
- Select Download and install updates (recommended) and click Next.
- Follow the on-screen instructions; when you get to the “Ready to install” screen, click Change what to keep.
- Select the “Keep personal files and apps” option and click Next.
- Follow the on-screen instructions to complete the upgrade.
- Once the process is complete, check for any remaining issues.
Remove the May Updates
- Open the “Run” accessory with the Windows key + R keyboard shortcut.
- Type appwiz.cpl in the Run “Open” text box and click the “OK” button.
- Click on View Installed Updates, and a window will appear directly in front of you.
- Next, select the KB4103727 or KB4103718 update and click Uninstall.
- Click Yes to confirm.
- You can use the Show or Hide Updates utility to prevent the update from being reinstalled. On this page, click “Download the Show or Hide Updates Troubleshooter Package Now” and save the utility to your HDD.
- Click on wushowhide.diagcab in the folder where you saved the Show/Hide Updates utility to display the window.
- Then click “Next” and select “Hide Updates“.
- If updates for KB4103727 or KB4103718 are in the list of updates, select them.
- Press “Next” to block the selected updates.
What is RDP?
RDP (remote desktop protocol) is a technology that enables full desktop functionality for a remote user, including remote sound, clipboard, printers, file transfers, and high resolution graphics that can be scaled down based on bandwidth. As an add-on to its Windows NT Server 4.0 Operating System, Microsoft debuted Windows Terminal Server in 1998. This add-on feature allowed for TCP/IP-based remote desktop access.
This feature, which gained popularity with the release of Windows XP, was included in every subsequent Windows OS release (circa October 2001). RDP has been the de facto standard for remote session access for Windows desktop and server operating systems since the introduction of XP. RDP has undergone numerous iterations over the course of its 20-year history, adding new features to help it develop into a dependable remote access protocol. RDP has experienced its fair share of security problems over the years.
The remote desktop protocol, a descendant of the T.128 application sharing protocol, uses a single TCP/IP port to establish a connection (the default is 3389). The key point to remember is that all traffic is typically point-to-point, encrypted, and contains all the information needed to effectively transmit and process an entire user experience remotely. This includes various mechanisms for fault tolerance, authentication, and even support for multiple monitors.
Final Words
So here we conclude our article on how to Remote Desktop Authentication Error on Windows. An error message stating that “An authentication error has occurred the function requested is not supported” may appear when you attempt to connect to another remote computer using Remote Desktop Connection. Usually, connecting from a machine to the remote server goes very smoothly.
However, occasionally you might notice the annoying error message “RDP Authentication Error Has Occurred – The Function Requested Is Not Supported” on your computer screen. This error might show up if your system has recently been upgraded. If after trying all of the aforementioned fixes you are still having problems, we advise you to visit the official Microsoft website and submit a support ticket.