If you are connecting from Windows 10 v1809 to Windows 2019 server, you might encounter a black screen bug.
This is a problem with routing Microsoft added inside the new RDP version.
There are 2 solutions
Solution 1
Install RDP App from Windows 10 store
Solution 2
Run Group Policy Editor. Navigate to Computer Configuration > Administration Templates > Windows Components > Remote Desktop Services > Remote Desktop Connection Client. Set the "Turn Off UDP On Client" setting to Enabled.
- Updated