What is a pfSense Serial Number?
Cause: You likely cloned a VM or restored a config backup from one Netgate device to another. The unique system ID and the physical serial number became mismatched. pfsense serial number
You can retrieve hardware serial information through the Shell (Option 8 in the console menu) using these commands: Primary Command: /bin/kenv smbios.system.serial. What is a pfSense Serial Number