FortiMonitor OnSight allow you to monitor servers from behind a firewall. In effect, OnSight acts as a monitoring node that you install behind your firewall, which can securely communicate back to our servers. OnSight can be set up to automatically discover all of the servers behind your firewall, and then add these to your FortiMonitor control panel so that you can perform network service checks just as you would with any of your public facing server. Once you install your OnSight you can use the web console to update and track your OnSight's perfomance.