To resolve a vulnerability issue with Credential Security Support Provider protocol (CredSSP), a monthly Windows update in May was applied which does two things: 1. Correct how Credential Security Support Provider protocol (CredSSP) validates requests during the authentication process 2. Change the group policy Encryption Oracle Remediation default setting from Vulnerable to Mitigated. This RDP authentication issue can occur if the local client and the remote host have differing Encryption Oracle Remediation settings that define how to build an RDP session with CredSSP. If the server or client have different expectations on the establishment of a secure RDP session the connection could be blocked. There is the possibility that the current default setting could change from the tentative update and therefore impact the expected secure session requirement. Examples: 1. ...