FortiManager 6.2.3 and FortiOS 5.6.12 compatibility issues
The following syntax introduced in FortiOS 5.6.12 is not directly supported by FortiManager 6.2.3.
config system fortiguard
set protocol {protocol}
end
In order to set the protocol used for FortiGuard communications by the FortiGate, either configure it on the FortiGate directly or by running a CLI script on “Remote FortiGate Directly”.