Refer to the exhibit, which shows the output of diagnose syssessionstat.

Session Table Overview:

The session table in FortiOS tracks all active and pending sessions. It includes details like the type of session (TCP, UDP, etc.), status, and statistics.

Interpreting the Exhibit:

The exhibit from thediagnose sys session statcommand shows detailed session statistics.

The specific value indicating "166 TCP sessions waiting to complete the three-way handshake" reflects the number of sessions that have initiatedbut not yet completed the TCP three-way handshake process (SYN, SYN-ACK, ACK).

References:

Fortinet Documentation: Understanding and troubleshooting session tables​(Hammertux)​.

Fortinet Community: Explanation of session states and statistics​(Welcome to the Fortinet Community!)​​(Hammertux)​.