3.1.7.7. Captive Configuration
The Captive configuration section basically consists of allow or disallow the Agent download:

Enable agent download on homepage: With this flag, administrators can control if they want the Agent Download to be available from the Administration Portal IP or not.
Agent download available only for authenticated users: Enable the flag to allow Agent download only for authenticated users.
Number of days that email validation requests will be archived: Configure the retention period that Captive e-mail validation requests will be archived.