Chapter 1 What’s New for FortiOS 5.2.1 : Security Profiles : Menu and Options Simplification : AntiVirus : Proxy Options
  
Proxy Options
If proxy inspection is used for AntiVirus, the addition Block or Monitor options are available for both detected viruses and Botnet C&C servers. The previous options for using FortiSandbox and protocol selection are also available.
Figure 22: Proxy options for AntiVirus