It's possible to serve a special portal when the HSMX detects it has no Internet connectivity. This portal can be used to inform the subscribers the Internet is currently not available or to serve offline content.
DNS resolving is used for offline-detection. The online-check is ran each minute and will attempt to resolve a static domain name (download.fdxtended.com) a user-configurable amount of times. If this fails the system is switched into offline-mode. The next minute DNS resolving is tested again successful offline-mode is turned off again.
There are two possible configurations in offline mode:
Display option to match your preference. Pick
Message to show the default offline message to your subscribers or select
Portal Rules. If you have selected for
Portal Rules browse to Layout → Portal Page → Rules and add a new rule. Adding a new portal rule is always a two step process. First we configure the general portal-rule settings that will be applicable once triggered.
Next step is to select the portal-rule trigger, we select
Portal Rules is selected but no rule matches […].