With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fgVpnSslStatsMaxUsers
fg Vpn Ssl Stats Max Users
1.3.6.1.4.1.12356.101.12.2.3.1.3
The maximum number of total users that can be logged in at any one time on the virtual domain
Back to FORTINET-FORTIGATE-MIB MIB page.
IPHost Network monitor allows you to monitor fgVpnSslStatsMaxUsers on Fortinet device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Fortinet WAN extenders right now.