. Watch Guard Gateway Anti Virus (Gateway AV) is a fully integrated security subscription for Watch Guard 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 & rogueware. Gateway AV scans traffic on all major protocols using continually updated signatures to detect & block all types of malware. & because Gateway AV is integrated with Watch Guard Firebox M400 security appliances you have an easy-to-manage cost-effective solution without additional hardware to purchase & maintain..