Remote Desktop: CredSSP Error

When connected in Remote Desktop, the following error is displayed:

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

Remote computer: IP or FQDN
The problem may be due to a CredSSP encryption oracle fix

To solve there are several solutions.

Solution 1: Disable NLA Authentication

On the server where the connection must be established disable 1 NLA authentication.

Disable NLA

Solution 2: GPO

The strategy should be applied at the client level:

Location: Computer Configuration / Administrative Templates / System / Credential Delegation / Encryption Oracle Correction


Enable the setting and choose Vulnerable for the protection level.

GPO Param

Solution 3: Registry Key

On the client computer, open a command window in Administrator and enter the following command:

reg add HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters /f /v AllowEncryptionOracle /t REG_DWORD /d 2

Solution 4: Update Servers and Extensions

Link to the updates to apply:CVE-2018-0886.

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