Troubleshooting & Maintaining Your PC All-in-One For Dummies, 3rd Edition
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You see firewall warnings on your Windows PC during one of two situations. First, because you're using a new program that accesses the Internet. Second, because something sneaky is trying to access the Internet or get into your computer from the Internet. In both situations, the firewall is unfamiliar with what's going on, so you're warned.

A typical firewall warning is shown here. The one you see on your screen may look different, but your actions remain the same:

PCs-firewall-warning A firewall warning.

Did you just start that program or do something that caused the program to ask for access? If so, allow the access. If not, deny access.

For example, if you're running an online, multiplayer game for the first time, you may see the firewall warning. That's an allowed use. On the other hand, if you see the firewall warning and don't recognize the program or you're not doing anything that requires Internet access, block the program.

• When you allow a program through the firewall, it won't ask again. That's because you created a new firewall rule that allows the program Internet access.

• You can unblock a program if you learn later that it's legitimate.

About This Article

This article is from the book:

About the book author:

Dan Gookin has been an author, editor, ghostwriter, and a public official. He's written more than a dozen Dummies books on technology, with a special focus on PCs, the Android operating system, and Microsoft products. And in 1991, he was the author of the very first Dummies book, DOS For Dummies, which started the whole enterprise.

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