execute upgrade /path/to/firmware
: The specific compilation build number, ensuring you are using a stable release of the 7.2.3 branch. fgtvm64kvmv723fbuild1262fortinetoutkvmqcow2
: Confirms it is a .qcow2 image, which is the native virtual disk format for QEMU/KVM environments. fgtvm64kvmv723fbuild1262fortinetoutkvmqcow2
Optimized for performance in Linux-based virtualization environments (Proxmox, OpenStack, KVM). How to Use the QCOW2 Image fgtvm64kvmv723fbuild1262fortinetoutkvmqcow2
Also ensure no firewall on the host is blocking port 443.
Then add a default route: