With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fgSysSesCount
fg Sys Ses Count
1.3.6.1.4.1.12356.101.4.1.8
Number of active sessions on the device
Back to FORTINET-FORTIGATE-MIB MIB page.
IPHost Network monitor allows you to monitor fgSysSesCount 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.
