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Fortinet Firewall Maintenance

Reference Azure

DOCUMENT CATEGORY: Reference SCOPE: Fortinet firewall maintenance PURPOSE: Provide procedures for reinstalling FortiOS, flashing, troubleshooting, and managing Fortinet firewalls MASTER REFERENCE: Fortinet Documentation

Status: Active

This document provides maintenance procedures, reinstallation steps, flashing instructions, troubleshooting, and management guidance for Fortinet firewalls (e.g., FortiGate-90G) used in Azure Local Cloud Demos Azure Local deployments.

Reinstalling FortiOS Software​

Using USB Drive​

  1. Download the FortiOS image (.out file) from Fortinet support.
  2. Format USB as FAT32 and copy the image.
  3. Boot the firewall into maintenance mode:
  • Connect console and power on.
  • Interrupt boot with any key during POST.
  • Select "Boot from USB" or maintenance mode.
  1. From the CLI:
execute restore image usb <filename>.out
  1. Reboot after restoration.

Using Network​

  1. Boot into maintenance mode.
  2. Restore via TFTP:
execute restore image tftp <filename>.out <tftp-server-ip>

Flashing the Device​

FortiOS reinstallation includes firmware flashing. For BIOS updates, contact Fortinet support.

Troubleshooting​

  • Boot Loops: Reset to factory defaults.
  • USB Issues: Ensure FAT32 format and correct file placement.
  • License Problems: Reapply licenses after reinstall.
  • Connectivity: Check interface configurations.

Management​

  • Default login: admin (password: leave blank initially).
  • Basic config:
config system global
set hostname fw00-iic
end
config system interface
edit port1
set ip 10.100.64.8/24
next
end

Data verified with Fortinet FortiOS Documentation as of 2026-02-02.

For questions about these procedures, refer to the Fortinet documentation or contact the Azure Local Cloud documentation team.