NOTE: FortiNAC is now named FortiNAC-F. For post-9.4 articles, see FortiNAC-F. FortiNAC is a zero-trust network access solution that provides users with enhanced visibility into the Internet of Things (IoT) devices on their enterprise networks.
Article Id 191117
The Persistent Agent becomes hung and cannot establish communication.

Communication between a Persistent Agent and NAC is established by first securing the connection via SSL.  There are times when the SSL connection may not complete.  The agent waits indefinitely for the connection and eventually hangs.

Symptoms include the following on a given host:

    Logged on User information not available
    Scans do not run
    Cannot send message
    "Lost Contact with Persistent Agent" events
    "Persistent Agent Scan Not Performed" events

Version:   Agent 3.x and above
Workaround: Restart the host or the agent.  Refer to related KB article below for instructions.

Solution:  Addressed in agent version 5.0.2 and above.  Refer to the latest Agent Release Notes and upgrade instructions.

Related Articles

Technical Note: How to restart the Persistent Agent