This handbook chapter describes concepts of troubleshooting and solving issues that may occur with FortiGate units.

This FortiOS Handbook chapter contains the following chapters:

Life of a Packet explains the different layers and modules a packet goes through in FortiOS, including the order of operations.

­Verifying FortiGate admin access security explains how to verify and configure administrative access.

Troubleshooting resources walks you through Fortinet’s resources for troubleshooting.

­Troubleshooting tools describes some of the basic commands and parts of FortiOS that can help you with troubleshooting.

Troubleshooting methodologies walks you through best practice concepts of FortiOS troubleshooting.

Technical Support Organization Overview describes how Fortinet Support operates, what they will need from you if you contact them, and what you can expect in general.