Result: The Group Policy Editor will open.
Verify that the firewall allows remote desktop connections with RDP (Port 3389).If that doesn't solve the problem enable RDP security layer in Group Policy on the machine: First make sure you have the most current version of the Microsoft RDP application from the Apple App Store and try again.Remote Desktop Connection cannot verify the identity of the computer that you want to connect to. When you try to establish a remote desktop session with a Windows 8.1 machine from Mac OS X using Microsoft Remote Desktop or Remote Desktop Connection for Mac, the connection fails with the following error message: Establishing an RDP connection with a Windows 8.1 client from Mac OS X Context
