This software may be blocked by Windows Firewall or by a third party program with Firewall like your antivirus. You can check if the Windows Firewall is not blocking the software by going to Start -> Control Panel -> Windows Firewall, click Allow a program or feature through Windows Firewall, and be sure that this program is checked. Be sure that you verify your antivirus firewall for the same issue. If none of this works, you can contact the developer on the following website for additional support.