Chapter 15 Unified Threat Management for FortiOS 5.0 : Client Reputation
  
Client Reputation
The Security scan types available on FortiGate units are varied and tailored to detect specific attacks. However, sometimes user/client behavior can increase the risk of attack or infection. For example, if one of your network clients receives email viruses on a daily basis while no other clients receive these attachments, extra measures may be required to protect the client, or a discussion with the user about this issue may be worthwhile.
Before you can decide on a course of action, you need to know the problem is occurring. Client reputation can provide this information by tracking client behavior and reporting on activities that you determine are risky or otherwise noteworthy.
To learn how to enable and customize Client Reputation on your FortiGate go to the following FortiGate Cookbook video:
Client Reputation Video