. WatchGuard Gateway AntiVirus (GatewayAV) is a fully integrated security subscription for WatchGuard Firebox M400 appliances. It works in tandem with the application layer content inspection of the Firebox M400 to provide real-time protection against known viruses trojans worms spyware and rogueware. Gateway AV scans traffic on all major protocols using continually updated signatures to detect and block all types of malware. And because Gateway AV is integrated with WatchGuard Firebox M400 security appliances you have an easy-to-manage cost-effective solution without additional hardware to purchase and maintain..