CredSSP encryption

Issue: Update Windows 10 machine could not RDP into server, following error was shown:

An authentication error has occurred. The function requested is not supported. This could be due to CredSSP encryption oracle remediation. For more information, see https://go.microsoft.com/fwlink/?linkid=866660

Resolution: Added the registry key REG ADD HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters\ /v AllowEncryptionOracle /t REG_DWORD /d 2

RDPed into the machine and did a windows update. Rebooted machine.

Removed registry key from Windows 10 machine. Rebooted

Blog article: https://blogs.technet.microsoft.com/mckittrick/unable-to-rdp-to-virtual-machine-credssp-encryption-oracle-remediation/