You may get this error when trying to connect to a Terminal Server from Windows 10 or Windows 7. The workaround is to add the following Registry key on the affected client PC. [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters] “AllowEncryptionOracle”=dword:00000002 This is NOT a fix. Doing this will bypass the fix for the security vulnerability. But it will get your users going … Continue reading Remote Desktop Issue: “An authentication error occurred” “This could be due to CredSSP encryption oracle remediation”