when you try to connect to Windows Server Using a Remote Desktop connection 

you may have this error

This could be due to CredSSP encryption oracle remediation

to solve this

Run CMD as Administrator

then copy and paste this command 

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