Hackers run scanning programs over the Internet, searching for computers with open ports. The hackers can use these ports to place programs such as Trojans on your machine. These open ports can also be used to send information back to a Web site.
A good firewall will make your computer invisible to the hackers' probes. It will also block outgoing transmissions.
The free version of Outpost Firewall offers basic protection for casual Web surfers and low budget systems. For more robust features, you must buy the Pro version.
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