With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fnAdminTable
FORTINET Admin Table
1.3.6.1.4.1.12356.100.1.2.100.2
A table of administrator accounts on the device. This table is intended to be extended with platform specific information.
Back to FORTINET-CORE-MIB MIB page.
IPHost Network monitor allows you to monitor fnAdminTable on Fortinet device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Fortinet firewalls right now.