How To Configure Windows Firewall
One of the most common causes of connection problems is Windows Firewall. If not configured correctly, Windows Firewall may block the connection between the app and server.
Open the Control Panel on your computer and click "Network and Internet".
Click "Network and Sharing Center".
Optional: If you are on a home network, then make sure your active network is configured as a "Home network".
Click "Windows Firewall" in the bottom left corner.
Click "Allow a program or feature through Windows Firewall".
Make sure "Unified Remote Server" is checked and enabled on "Home/Work" and optionally "Public".
Press OK to finish. Note you may have to restart Unified Remote Server and/or restart your computer for the changes to take effect.