Added the Fortinet Fortigate mibs to the SIM server, recompiled ALL mibs and re-registered them all. Restarted the SIM service on the VM and here's a curious thing that I've noticed. Though the 2 Fortinet cfg files are in the mibs folder, when I look at SIM ->Options -> Events -> SNMP Trap Settings, I do not see the Fortinet MIBs listed.
Is this normal and/or expected behaviour? Did I miss a step along the way?