Chapter 2 Getting Started : Basic Administration : Administrators : Security Precautions : Disable the console interface
  
Disable the console interface
To prevent any unwanted login attempts using the COM communication port, you can disable login connections to the FortiGate unit.
This command is specifically for the COM port. You can still use FortiExplorer to connect and configure the FortiGate unit if required.
To disable an interface:
config system console
set login disable
end
See Also
Security Precautions
Passwords
Preventing unwanted login attempts
Disable admin services
Disable interfaces
SSH login time out
See Also
Idle time-out
HTTPS redirect
Segregated administrative roles