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How to solve RDP access error "CredSSP Encryption Oracle Remediation"

With the release of the March 2018 Security bulletin, it causes some changes. When you try to connect to updated VMs, you probably get error like below.

[Window Title]
Remote Desktop Connection

An authentication error has occurred. The function requested is not supported

Remote computer:
This could be due to CredSSP encryption oracle remediation.
For more information, see


Refer to Unable to RDP to Virtual Machine: CredSSP Encryption Oracle Remediation – Azure Virtual Machines to know detail. In this article, I will describe how to solve this issue simply.

Execute gpedit.msc and go to Computer Configuration / Administrative Templates / System / Credentials Delegation like below.

Change Encryption Oracle Remediation policy to Enabled, and Protection Level to Vulnerable like below.