config system dhcp server edit 1 set default-gateway 10.0.0.1 set netmask 255.255.255.0 set interface port3 config ip-range edit 1 set start-ip 10.0.0.100 set end-ip 10.0.0.200 next end next end

The IDE/SATA controller order is wrong. Fix: Go to Storage settings. Add a new SATA controller, then attach the VMDK to port 0. Remove the IDE controller.

FortiOS expects hardware acceleration. While VirtualBox doesn’t support SR-IOV or PCI passthrough perfectly, these tips help:

Without a license, the VM runs in – limited to 10 policies, no updates, and a nag screen.