HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters /v AllowEncryptionOracle /t REG_DWORD /d 2) or change the local policy Encryption Oracle Remediation by setting its value to Vulnerable.
To do this, change the registry parameter AllowEncryptionOracle (use the command: REG ADD You can re-configure your desktops by allowing them to connect to the Remote Desktop with an unsafe version of CredSSP (as described in the article at the link above). You can disable NLA (Network Level Authentication) on the RDP server side (as described below) The most correct way to solve the problem is to install the latest cumulative Windows security updates on a remote computer or RDS server (to which you are trying to connect via RDP).What can you do to fix this problem and connect to your RDP server? Your computer simply blocks the remote desktop connection to a server that uses the vulnerable version of CredSSP. NLA uses CredSSP mechanisms to pre-authenticate RDP users over TLS/SSL or Kerberos. These updates are not installed on your RDP/RDS server side, and the NLA (Network Level Authentication) is enabled for remote desktop access. These updates fix a serious vulnerability in the CredSSP protocol (Credential Security Support Provider) used for authentication on RDP servers ( CVE-2018-0886 – read carefully the article RDP authentication error: CredSSP Encryption Oracle Remediation). Why is this happening? The fact is that the latest security updates (released after May 2018) are installed on your Windows 10 desktop. The RDP error “An authentication error has occurred” can also appear when trying to run a RemoteApp application. It’s pointless to solve this problem by removing installed Windows update because you are exposing your computer to the risk of exploiting the various vulnerabilities that this update fixes. A new cumulative Windows update package will arrive and will be installed next month, and the RDP authentication error will return. As I understand, this is a temporary workaround.
After I uninstalled the latest updates and rebooted my computer, I was able to connect to a remote server via RDP.
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