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Comodo's free Firewall is your first layer of defense against viruses, worms, trojans, hackers and other internet threats. Comodo's Firewall uses Default Deny Protection to prevent threats from occurring, rather than just detecting them when it's already too late. With a single click you can allow or block access to the internet, offering complete immunity to attacks and total protection of your personal information. Comodo Firewall also features cloud based scanning and behavior analysis of unrecognized files - making Comodo Firewall unbeatable at detecting zero-day attacks. Under default settings, unknown and untrusted files are run in a virtual environment (sandbox) on your local machine so they cannot modify or affect data on your 'real' system. While sandboxed, the file undergoes behavior analysis on our cloud servers to test whether it is safe to run in the long-term. This ground-breaking method of protecting your PC means that only trusted applications are allowed to run. Malware and untrusted files get nowhere near anything important AND you get to use your computer without interruption from nagging alerts. The software also boasts a powerful packet filtering firewall that helps you securely connect to the internet while blocking hackers from making incoming connections. It's easy to use and features an attractive interface that lets even beginners change settings to their liking. Download it now and find out why prevention-based protection is the security technology of the future. Comodo Firewall is completely free for life.