Chapter 1 What’s New for FortiOS 5.2.1 : System Features : Disabling FortiExplorer, the USB MGMT Port, and the Serial Console
  
Disabling FortiExplorer, the USB MGMT Port, and the Serial Console
New CLI commands have been added allowing you to disable access for FortiExplorer on Windows and OS X and the USB MGMT port, or for the serial console, FortiExplorer iOS, the USB MGMT port, and 3G/4G MODEM access.
Syntax
1. Disable FortiExplorer on Windows and OS X and the USB MGMT port:
config system console
set fortiexplorer disable
end
2. Disable serial console, FortiExplorer iOS, and 3G/4G MODEM access:
config system console
set login disable
end