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The folks over at On-Ramp Indiana found a fix for this one.
The Microsoft Tech Article can be found here…
Symptoms
Consider the following scenario:
- The Credential Security Support Provider protocol (CredSSP) updates for CVE-2018-0886 are applied to a Windows virtual machine (VM) (remote server) in Microsoft Azure or on a local client.
- You try to make a remote desktop (RDP) connection to the server from the local client.
In this scenario, you receive the following error message:
An authentication error has occurred. The function requested is not supported. Remote computer: <computer name or IP>. This could be due to CredSSP encryption oracle remediation. For more information, see https://go.microsoft.com/fwlink/?linkid=866660.
If you are getting a CredSSP error message when trying to RDP to a server add this registry key to your local computer. It will disable CredSSP
- [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters] “AllowEncryptionOracle”=dword:00000002