I am using Remote Desktop Connection on Windows 10 and it can not connect to the another PC I used to connect to with Windows 8.1. On the Windows 10 PC, I have the firewall open to allow RDC to go through but it can not connect. I used to connect to several PCs and servers from my Windows 8.1 PC with RDC, but when I upgraded to Windows 10, RDC could not connect. I am using the new Windows 10 app and RDC found in %SystemRoot%\system32\mstsc.exe. Neither work.