A captive portal is used to log into networks

Calling up captive portals is similar to logging into public networks such as those of hotels, restaurants and train-stations.

In the case of CSN, captive portals are used to register devices.

Captive portals open up automatically directly after connecting to the correctly connected router. If they do not: one can call them up by opening a webbrowser. Usually one can spot a button calling for logging into the network.

'The captive portal still doesn't show up?'
Try initiating it manually by calling it up in your webbrowser: