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Step 4: Restart your computer and then check if the “An authentication error has occurred” error is gone. Step 3: Go to the Remote tab and then uncheck the Allow connections only from computers running Remote Desktop with Network Level Authentication (recommended) option. To confirm the settings, provide Email ID in the Test Email Lookup Field and Click on Test. Then provide LDAP Server and Authentication details as below: 4. Select Scan tab, and then Network Contacts Setup. Step 2: Type sysdm.cpl in the box and then click OK to open the System Properties window. Open HP Embedded Web Server (HP EWS) in a web browser. Step 1: Press the Win key + R key at the same time to open the Run box. In order to fix the “An authentication error has occurred the function requested is not supported” error, the first step you can take is to change the remote desktop settings. Method 1: Change the Remote Desktop Settings

So how to fix the “Remote Desktop An authentication error has occurred” error? The methods are shown below. When you try to establish a connection with another remote computer using Remote Desktop Connection, you may get an error message saying that “An authentication error has occurred the function requested is not supported”. You can find several efficient methods to fix the error. What will you do when you encounter the error “An authentication error has occurred”? If you don’t know, then this post written by MiniTool is what you need.