Chapter 1 What’s New for FortiOS 5.2.1 : Top Features : Captive Portal
  
Captive Portal
Several new options have been added for captive portals:
External captive portals
Using groups from the security policy
Exempting a policy
Replacement messages
New configuration options for wireless
WPA personal security + captive portal for wireless
For more information, see “Captive Portal” and “Captive Portal for WiFi”.