When you want to connect a Unsecured WiFi on Android such as those in Coffee shops and some hotels, usually a login prompt with the captive page pops up, you click a few things and you are connected to the WiFi hotspot.
However, sometimes you end up with a security error on loading the Hotspot Portal Page. The mobile user has to go through a two-step process to access the WiFi Connection.
First, the selection of the Wi-Fi network from your Android phone WiFi settings.
Then you have to go to the authentication page (portal page) that may ask you the password or tap on “Agree” etc.
After this step, you will be able to browse the internet.
The second step is the most common place where people get stuck with the authentication page and sometimes it doesn’t appear.
The problem occurs mostly due to trying to access a secure (HTTPS) website.
Your browser wants to access say https://google.com, but the response is coming from the WiFi portal itself, telling your phone to redirect to the Login page.
This throws up a security error, which indeed it should - You don't want your browser responding to content it knows is not from the requested website
The easy fix is to load up a non-secure site. The Wifi portal injects it's redirect to tell your browser where to go, and as there is no security, it does just that.
With secure sites (HTTPS) becoming more prevalent (and rightly so) this is getting more difficult. And so, this site will always respond to http requests for that purpose.
Bookmark this page or Add to Homescreen for a quick shortcut when you are not getting any response.