Take a Mac PC or notebook and try to connect to a Windows server using the Version 2.1.1 of Microsoft Remote Desktop Connection Client for Mac.
It may (should) connect ok with a server that only has the administrative access remote desktop enabled.
But, it fails to work with a Remote Desktop Server (aka Terminal Services server).
When you exit the application with Cancel rather than Reconnect, you may get a Microsoft Error Reporting prompt:
and checking for More Information shows:
which shows error details as follows:
Microsoft Error Reporting log version: 2.0
Date/Time: 2015-03-24 02:32:36 +0000
Application Name: Remote Desktop Connection
Application Bundle ID: com.microsoft.rdc
Application Signature: MSRD
Application Version: 184.108.40.206309
Crashed Module Name: libobjc.A.dylib
Crashed Module Version: unknown
Crashed Module Offset: 0x000010a7
Blame Module Name: TSClient
Blame Module Version: 1.0
Blame Module Offset: 0x000dcd5a
Application LCID: 1033
Extra app info: Reg=en Loc=0x0409
Crashed thread: 13
A simple resolution that worked for me was to use the Microsoft Remote Desktop v 8.0.14 app from the App store rather than this Microsoft Remote Desktop Connection Client for Mac