So what happens when you install a firewall and make sure all operating systems on your home network are fresh installs?
You’ll probably see hits from foreign and U.S. IP addresses trying to make connections to your computers, phones and other devices on your network. You’ll also notice common port numbers in the above log. So what would happen if any of the services and ports were open? It could result in the loss of data.
What should you do? Install a hardware SOHO firewall and keep your OS firewall on. While there are tons of other precautions you also need to take, ultimately this is a form of protection most home users and business users fail to implement.
Credit: Chris Davis