Recently upgraded to new PCs with Windows 8.1. Have been using the Microsoft RDP Client for MAC for years. Connecting directly to individual PCs with unique port numbers. Now getting the error: Remote Desktop Connection cannot verify the identify of the computer that you want to connect to. This is on the MAC client side. One is OSX 10.5 the other is 10.7 with same results.
Windows 8.1 PCs are in a domain environment with a 2012 Essentials server. Can connect to all the Win 7 PCs in the same domain.