Microsoft has released a few security patches in March 2018 to fix the vulnerabilities for the CredSSP (Credential Security Support Provider Protocol) used by the Remote Desktop Protocol in Windows Server. But a recent update has made CredSSP Authentication error in RDP and caused issues for many users attempting to login to a server running Windows OS.
To resolve this issue, please follow the steps below on your client machine:
1. Go to “Run” (Win Key + R)
2. Type “gpedit.msc” and click “Enter”
3. Go to Computer Configuration -> Administrative Template -> System -> Credentials Delegation -> Encryption Oracle Remediation
4. Double Click on “Encryption Oracle Remediation”, choose “Enable” and change protection level to “Vulnerable” and click “Apply” or “Ok”