Best 7 Firewall Software

A firewall is a hardware or software solution to enforce security policies. In the physical security analogy, a firewall is equivalent to a door lock on a perimeter door or on a door to a room inside of the building ¨C it permits only authorized users such as those with a key or access card to enter. A firewall has built-in filters that can disallow unauthorized or potentially dangerous material from entering the system.

1. Sygate Personal Firewall (Norton Internet Security)

Free for personal use, Sygate Personal Firewall provides best of breed security in a user friendly interface, protecting your PC from hackers, trojans and DoS attacks.

Sygate Personal Firewall has been replaced by an advanced "Smart Firewall," available in Symantec's Norton Internet Security.

2. ZoneAlarm Firewall

ZoneAlarm is an easy-to-use firewall that blocks hackers and other unknown threats. Automatic Program Configuration provides safety and simplicity by automatically configuring programs. Automatically decides whether to allow or deny Internet access to individual programs.

3. Comodo Firewall

Comodo has put firewall through all kinds of sophisticated tests to ensure its firewall powerful enough to ward off these attacks with default settings.

4. CA Personal Firewall

CA Personal Firewall helps protect your PC from both known and unknown threats, providing comprehensive, business-strength hacker and privacy protection.

5. Lavasoft Personal Firewall

Lavasoft Personal Firewall 3.0 provides the critical protection you need to keep your PC safe from unauthorized access.

6. Outpost Firewall Pro

Outpost Firewall Pro will detect and prevent malicious applications from trying to transmit data out of your PC.

7. Kerio Personal Firewall

Sunbelt Personal Firewall used to be called the Kerio Personal Firewall (KPF). Kerio was going to discontinue it, but Sunbelt acquired it from Kerio to save the product from "going under".