Captive Portal Authentication
If Captive Portal authentication scheme is enabled, non-authenticated anonymous users are redirected to Captive Portal page upon first connection to the proxy.
After verifying provided credentials, Captive Portal will store the name and IP address of the authenticated user in the session database and allow access. The name of the user will be used for selection of appropriate filtering policy and will also be visible in the access log.
To configure Captive Portal, navigate to Admin UI / Squid Proxy / Auth page and select tab Captive Portal.