Friday, May 11, 2018

Oracle CredSSP Encryption Error

I remotely manage about a dozen or so Hyper-V servers from a remote workstation and my post on how to setup and configure it is here.  However that changed this morning when I logged in and tried to connect to one of my remote Hyper-V servers using the console and got the error 

Remote desktop would not connect, giving the following error
An Authentication error has occurred.
The function requested is not supported.
This could be due to CredSSP encryption oracle remediation

After doing some checking it appears to have come from the last series of windows updates around May 8, 2018.

The resolution is a registry entry on the machine your connecting from.

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters] "AllowEncryptionOracle"=dword:00000002



You will need to make the keys CredSSP and Parameters as shown above.  Then add a 32bit dword with the value of 2.

You will NOT need to reboot, you will be able to connect to the console right away.

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