How to fix: Remote Desktop Authentication Error Has Occurred. The Function requested is not supported.

Patch Tuesday Remote Desktop Server Uncategorized Windows

Remote Desktop Connections Error Dialog Box

authentication error has occurred. The function requested is not supported Remote computer: <computer name=""> This could be due to CredSSP encryption oracle remediation. For more information, see https:/

The error impacts:

  • Remote Desktop Connection
  • Remote Desktop Connecting to Azure VMs
  • VPN Network Connections (before one can even try to use Remote Desktop)

Fix Option 1:

Change the Group Policy on your local client to use the vulnerable setting 

Run:  gpedit.msc

Go to Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Encryption Oracle Remediation

Double click on “Encryption Oracle Remediation”

In the new dialog box choose the “Enable” radial button, then change protection level Vulnerable and select the “OK” button

Encryption Oracle Remediation GPO Dialog Box

Fix Option 2:

Open the control pan -> System and Security -> Allow remote access

Remove the tick from the “Allow connections only from computers running Remote Desktop with Network Level Authentication”.

Windows RDP System Properties Dialog Box



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