Unable To Load — Fortiguard Ddns Servers List On Fortigate Firewalls
The "Unable to load FortiGuard DDNS servers list" error is a common issue typically caused by DNS configuration conflicts, communication protocol mismatches, or firmware-specific bugs. It generally occurs when the FortiGate firewall cannot reach the FortiGuard servers to retrieve available domain options. Core Causes and Solutions 1. DNS Override Conflict
Go to Network > DNS and confirm Use FortiGuard Servers is selected. The "Unable to load FortiGuard DDNS servers list"
- Some FortiOS versions have FortiGuard or DDNS-related bugs; check release notes and apply recommended patches.
- If running a very old or very new release, test on a maintenance device or schedule upgrade/downgrade per Fortinet guidance.
Description:
When attempting to configure a Dynamic DNS (DDNS) service on a FortiGate firewall, the FortiGuard DDNS servers list fails to load. Instead of seeing available service providers (e.g., fortiddns.com, noip.com, etc.), the list remains empty or returns a “Failed to retrieve server list” error. Reset FortiGuard Configuration: