If different FIMs or FPMs in a FortiGate-7121F chassis have different BIOS versions, then the CLI and GUI of FIMs or FPMs with older BIOS versions may incorrectly indicate that the firmware signature is un-certified or not certified by Fortinet. This is an issue with signature handling, the signatures that are created are correct and work as expected. Reinstalling the same firmware build may resolve this problem.

The FortiGate-7121F does not load balance ICMPv6 non-0x80/81 traffic as expected. All ICMPv6 non-0x80/81 traffic should be forwarded to the primary FPM. But, for example, ICMPv6 non 0x80/0x81 traffic received by a VLAN added to a LAG is broadcast to all FPMs. The same traffic received by a VLAN added to a physical interface is forwarded to the primary FPM as expected.

HA synchronization problems discovered during configuration synchronization stress testing. The stress test involved repeatedly deleting and adding VDOMs.