Microsoft Security Patch Breaks RDP - Yep - You Read It Correctly

Earlier this month, May 2018, Microsoft released a new security patch to address the CredSSP Encryption Oracle issue. In doing so, RDP (Remote Desktop Protocol) may be broken on workstations and servers where the patch was deployed.

With this new patch, both the client machine and the destination machine trying to start an RDP session, need to have the new patch installed or an error will occur and RDP connection will be denied.

https://blogs.technet.microsoft.com/mckittrick/unable-to-rdp-to-virtual-...