Both the built-in FDS and devices use certain protocols and ports to successfully request and receive updates from the FDN or override server. Any intermediary proxies or firewalls must allow these protocols and ports, or the connection will fail.

For troubleshooting information and details on FDN ports, see and the Knowledge Base article FDN Services and Ports.

After connecting to the FDS, you can verify connection status on the FortiGuard Center page. For more information about connection status, see “Connecting the built-in FDS to the FDN”.