. Watchguard WebBlocker is a fully integrated 1-year security subscription for all WatchGuard Firebox M400 Firewall appliances. It allows IT administrators to manage web access and content for stronger security and control of web surfing. WebBlocker blocks malicious sites to keep your network protected from risky web content. It helps conserve network bandwidth prevent legal liability from inappropriate content and increase employee productivity while it guards the network against malicious attacks from rogue websites. And because WebBlocker is integrated with the WatchGuard security appliance you have an easy-to-manage cost-effective solution with no additional hardware to buy..