Chapter 3 Authentication for FortiOS 5.0 : Agent-based FSSO : Troubleshooting FSSO : User status “Not Verified” on the Collector agent
  
User status “Not Verified” on the Collector agent
When selecting “Show logon Users” in the Collector agent, some users may have their status set as “Not Verified”.
The Collector agent receives logon events for users from the DC agents, but Windows does not generate log out events. As such, the Collector agent needs to verify that the user is still logged on by checking the registry on that host.
If the Collector agent cannot connect to the host on ports 139 and 445 to perform this check, the host status is set to “Not Verified” and a log entry will be added to the Collector agent logs:
"01/01/2010 01:23:45 [ 1884] name_ip_match: failed to connect to workstation: <Workstation Name> (192.168.1.1)"