Chapter 3 Authentication for FortiOS 5.0 : Agent-based FSSO : Troubleshooting FSSO : After initial configuration, there is no connection to the Collector agent
  
After initial configuration, there is no connection to the Collector agent
The Collector Agent has been configured but now cannot be contacted. This may be a regular connectivity problem. The section Troubleshooting Connectivity in the FortiOS Handbook Troubleshooting chapter will help locate and identify any network problems. Other solutions specific to FSSO are listed here.