CredSSP encryption oracle remediation

Error

We recently had an issue with remote desktop connection to a Windows 2012 server from a Windows 10 Pro client computer that was recently updated.

An Authentication error has occurred.
The function requested is not supported.
Remote computer: <servername>
This could be due to CredSSP encryption oracle remediation

CredSSP updates for CVE-2018-0886

Solution

We had to create a registry key HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters; both the CredSSP and Parameters keys had to be created, and then create the AllowEncryptionOracle DWORD and give it a value of 2, worked for me on both Windows 7 and Windows 10 Pro computers. A reboot was not needed.
Registry path: HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters
Value: AllowEncryptionOracle
Data type: DWORD

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