Firewalls are an essential for any computer connected to the internet. Firewalls can potentially protect your computer from being taken over by hackers.

The Leviathan PC Firewall is an application which will prevent hackers from accessing your computer, it will monitor and log activity on certain ports (which can be customized) and has other features including Keep Alive to maintain your connection.
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Outpost Firewall is the most feature-packed Personal Firewall for Windows in the world. It gives peace of mind from any threats by Cookies, Ads, E-mail viruses, Backdoors, Spyware, Crackers, Adware and virtually every other Internet danger. Outpost keeps your computer in stealth mode, making it invisible to potential attackers. It even lets you browse the Internet without annoying advertisements. No lengthy configuration is needed. Outpost starts protecting against all kinds of internal and external attacks as soon as it's installed. It's the perfect choice for protecting yourself and increasing the connection speed for home and office use. PLUS Outpost is the first personal firewall developed with Open Architecture so anyone can create his or her own plug-ins!
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Kaspersky Anti-Hacker is the personal firewall, which provides full-scale protection for PC, running Windows, from all the attempts of non-authorized access to data, as well as from the hacker attacks both from Internet and Intranet. Full-scale control over the network activity
Kaspersky Anti-Hacker provides control over the computer activity on the base of two-level analysis of system network activity.
Tracking activity of Internet-connected applications (high -level operations). Integrated analysis of activity of such Internet- connected applications like Web-browsers, mail applications, file transfer application, etc.
Packet filtration of incoming and outgoing data (low-level operations). At this level Kaspersky Anti-Hacker analyses directly the packets, sent or received by computer.
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