Fortinet Product Lifecycle (requires login)

Fortinet - FortiOS Handbook - Vendor-specific attributes (RADIUS)
Chapter 16 SSL VPN for FortiOS 5.0 : Basic Configuration : User accounts and groups : Authentication of remote users : Setting the client authentication timeout
Chapter 16 SSL VPN for FortiOS 5.0 : Basic Configuration : Configuring SSL VPN web portals : SSL connection configuration

Resetting a lost admin password
The Fortinet Cookbook - Supported Upgrade Paths - FortiOS

Index of Knowledge Base articles

Configure SSL VPN using RADIUS user groups
Remote Admin login with Radius selecting admin access account profile
FortiGate Radius VSA Dictionary (vendor-specific attributes)
Customizing Session TTL in FortiOS 4.0
Session TTL values and Policy RST for Sessions

Fortinet Cookbook - SSL VPN with RADIUS authentication
Boll Tech Blog - FortiGate Radius Authentication mit Identikey Group Attributes
Ilantz's Weblog - Configure Session TTL / Timeout in Fortinet
Security Confidence - FortiGate Authentication Timeout Behaviors
Fortinet GURU - Where Fortinet Is Messing Up
Clarity Software Systems - The Occasional Pain of Upgrading Firmware
reddit - fortinet - Fortigate Upgrade 5.2.2 -> 5.4.4
Boll - Tech Blog - FortiOS 5.4.1 Upgrade / Boot Issue with FortiGate 60D

Fortinet Forums - [Other FortiGate and FortiOS Topics] » User and Authentication » FreeRADIUS using Fortinet-Group-Name attribute
Fortinet Forums - [Other FortiGate and FortiOS Topics] » VPN » FortiGate - SSL VPN - Web Portal “use a Radius Server for Authentication and then depending on LDAP group membership, it will display the appropriate Web Portal”.

YouTube - Fortinet Fortigate 80CM firewall #teardown on 2022-11-18 by Computers Cats and More.
YouTube - Fortinet Fortigate FG-60D Firewall #teardown on 2021-08-11 by Computers Cats and More.