admin36

Not sure if this still requires a solution... as it turns out (after a lot of dicking around on my part, since I was running into the same problem, also with gnome-remote-desktop), you have to edit the entry for the linux server in Remote Desktop Manager. Advanced tab --> change RDP version to "RDP (FreeRDP Latest)".

The windows remote desktop client obviously falls back to this protocol without prompting/notifying.

Cheers!