diagnose test application fortiguard 1 diagnose test application update 1 execute reboot (if necessary)
Ensure your FortiCare contract is valid, as DDNS is a subscription-linked service. Troubleshooting Checklist Command/Path Verify Connection Ping FortiGuard servers from CLI exec ping service.fortiguard.net Check DDNS Status Run a diagnostic test diagnose test application ddnscd 3 Restart Service Force the DDNS daemon to restart fnsysctl killall ddnscd Manual Reconfig Delete and recreate the DDNS entry config system ddns -> delete 1 Technical Tip: Unable to load FortiGuard DDNS server list
If the GUI still won't populate the list, you can bypass the visual menu and configure DDNS directly via the CLI.
Run execute ping update.fortiguard.net in the CLI.