[Fixed] CredSSP encryption oracle remediation error when RDP to a Windows VM in Azure

In this post, I will show how I fixed the error An authentication error has occurred. The function requested is not supported. while connecting with RDP.

CredSSP encryption oracle remediation

Earlier this RDP was working fine. But after I did windows update, it stopped working.

Solution:

Step1: Open a PowerShell window as Administrator.
Step2: Copy & Past command REG ADD HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters\ /v AllowEncryptionOracle /t REG_DWORD /d 2
Step3: Press enter and it will show message success like below image.

power shell

Now go ahead and open you RDP and it will work like charm.

Cheers!

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