[Window Title]
Remote Desktop Connection[Content]
An authentication error has occurred.
The function requested is not supportedRemote computer:
This could be due to CredSSP encryption oracle remediation.
For more information, see https://go.microsoft.com/fwlink/?linkid=866660
The most annoying part about this was everything was fine
So I did the usual checks
1. Make sure the Windows Remote Management (WS-Management) Service is running
2. verify that CredSSP is enabled
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Get-ChildItem -Path WSMan:\localhost\Client\Auth |
3. Review the current settings
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get-wsmancredssp |
4. Make sure delegation is allowed from the host hyper-v server
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get-item wsman:\localhost\client\trustedhosts |
Everything looked ok
Finally I stumbled on this MS article on credssp remediation error when RDP
Made the necessary registry key and value here
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters
“AllowEncryptionOracle”=dword:00000002
There is no reboot required, it worked immediately.
Yes you may now be vulnerable to the encryption oracle attack see Microsoft here