Windows Firewall is a security feature that is enabled by default in Windows and it sits at the door of your computer allowing and denying programs as they enter your computer from another computer either on the Internet or locally.
It times, programs that you want allowed on your system are also blocked by Windows Firewall. For instance, some multiple-players game online will required that a specific port (door) be opened on your computer, and if Windows Firewall is not aware of that program, it will block it as well.
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