A FortiGate is configured to receive push updates from the FortiGuard Distribution Network, however, they are not being received. Which is one reason for this problem?

Being connected to multiple ISPs (e.g., with SD-WAN) does not inherently prevent FortiGuard push updates, as long as connectivity to FDN is stable over at least one path.

FortiGuard scheduled updates are an alternative to push updates (pull vs. push), but enabling scheduled updates does not *prevent* push updates from being received if the FortiGate is configured for them; rather, it's a different update method.

A FortiGate in Transparent mode still requires management access and can receive FortiGuard updates, including push updates, provided it has proper network connectivity and routing to the FDN.

FortiGuard push updates rely on persistent connections from the FortiGate to the FortiGuard Distribution Network, which can be disrupted if the external interface's IP address is dynamically assigned via DHCP and subsequently changes or if NAT mappings are unstable, making a static IP address generally more reliable for push services.