SCADA systems are specialized computer networks and devices that work in concert to monitor and control key processes involved in the management of machinery, equipment and facilities. Measurements taken from a variety of sensors (temperature, pressure, flow etc.) are used to make decisions, for example; to open a valve and release water from a tank when it fills up, or to initiate an emergency shutdown of a nuclear power plant. Loss of access to or misuse of these systems could result in severe physical damage, disruption and financial loss to a company. Therefore, security of these SCADA systems should be a high priority. FortiGate consolidated security appliances provide defence-in–depth capabilities which “virtually patch” vulnerable systems, minimising disruption to the SCADA network.