With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fgFwUserVdom
fg Fw User Vdom
1.3.6.1.4.1.12356.101.5.2.2.1.1.5
Virtual domain the user account exists in. This index corresponds to the index used in fgVdTable.
Back to FORTINET-FORTIGATE-MIB MIB page.
IPHost Network monitor allows you to monitor fgFwUserVdom on Fortinet device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Fortinet access points right now.