Online Armor Free
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Full user review
Light weight, excellent protection, unobtrusive, user friendly
Bug in the system tray activity may freeze if the GUI interface is launched repeatedly. Does not affect protection, the OA service is robust. Conflict with steam ingame community, just exempt the steam directory, this may have been fixed already.
One of my two favorite firewalls. The other is outpost. Online armor seems to offer just slightly better protection right now (www.matousec.com), and have slightly fewer conflicts with other programs. There is a known conflict