Go to Start > Control Panel > System and Security > Windows Firewall > Allow a program or feature through Windows Firewall. Press Allow another program button, navigate to the installation directory of FreeVPN using the Browse option and select its executable file. Click Add and restart your computer. In addition, go to your antivirus settings and make sure that its firewall is not blocking the application. If the program is not solved, I suggest you to upgrade the application to HMA! Pro VPN.