The serial console method allows management access to the FortiGate CLI without relying on network connectivity. This method involves directly connecting a computer to the FortiGate device using a serial cable (such as a DB-9 to RJ-45 cable or USB to RJ-45 cable) and using terminal emulation software to interact with the FortiGate CLI. This method is essential for situations where network-based access methods (such as SSH or Telnet) are not available or feasible.
Reference:
FortiOS 7.4.1 Administration Guide: Console connection