Chapter 10 Install and System Administration for FortiOS 5.0 : Advanced concepts : Replacement messages list : Administration replacement message
  
Administration replacement message
If you enter the following CLI command the FortiGate unit displays the Administration Login Disclaimer whenever an administrator logs into the FortiGate unit’s web‑based manager or CLI.
config system global
set access-banner enable
end
The web‑based manager administrator login disclaimer contains the text of the Login Disclaimer replacement message as well as Accept and Decline buttons. The administrator must select accept to login.