Unable to RDP: CredSSP Encryption Oracle Remediation

Error Message:

If you are getting the error:

An authenticaion error has occurred.

The function requested is not supported.

This could be due to CredSSP encryption orarcle remedition.

With the release of the March 2018 Security bulletin, there was a fix that addressed a CredSSP, “Remote Code Execution” vulnerability (CVE-2018-0886) which could impact RDP connections.

Solution:

• Open a Command Prompt window as Administrator.
• Run the following command to add a registry value:

REG ADD HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters\ /v AllowEncryptionOracle /t REG_DWORD /d 2

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