Remote Desktop Authentication Error Has Occurred. The function requested is not supported


An 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:/


Since the Microsoft Security Patch on Tuesday, we’ve received many reports of users having connection problems like this: 


The error impacts:

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


  1. On your Local Computer
  2. Open up RUN
  3. Type in:

  4. Navigate to the following Computer Configuration.Computer Configuration / Administrative Templates / System / Credentials Delegation
  5. Double click on Encryption Oracle Remediation– 1 Enable Encryption Oracle Remediation
    – 2 Change Protection level to: Vulnerable


Any issues – please post in the comments below.

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