Guacamole server is unable to make rdp connection with windows system and guacd library will throw this exception because windows remote desktop setting is not enabled.
Enable remote desktop setting:
this will solve the problem, if not make sure firewall ,antivirus and windows defender are turned-off as well in-case.
Enable remote desktop setting:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh66iwgpGM3wXXGszjqMMZ3GeTjwMvCI8OI-06l1x_lTenAWt6NoMYVqkAwD32cEkvc2dnjp6t2vitOgeuxVPUm3vUW92gHsgpdV1QzEllcuf1zH6b4BUUhqwbeWG5xNKjTHFjJXKnPLvN7/s320/system_settings.png)
this will solve the problem, if not make sure firewall ,antivirus and windows defender are turned-off as well in-case.