Hello Android Enthusiasts!
I am the manager of an Internet Cafe on a cruise ship, and we're being plagued by a persistent problem that I can't quite solve.
We have a wireless network throughout the ship which can be used to access the Internet, but also includes a local intranet through which guests can view the daily events schedule, check their account, and use a free internal messaging service.
The issue we are running into seems to be with Captive Portal detection, and from my observations it appears to be affecting only Samsung phones (might just be S4 and higher), and has been observed on every OS from 4.2.2 and up. What happens is that they connect to the wireless network, and are then told that sign-in is required. A captive portal window will pop up, which does bring up our home page. If they then connect to the Internet, no problem. But if they just want to use the intranet, or if it takes them too long to fill out the user registration form, they get told that the network has been disconnected and we have to start over again from "sign-in is required."
I've done quite a bit of searching online for answers, and one is that the user must select "use network as is" from the captive portal options, but I see this option on very few devices. Other options have involved rooting the phone and running some terminal commands, which is obviously not something I can ask the guests to do.
We posed the issue to our shoreside networking team, and they came back saying they had whitelisted the following URLs and that this should fix the problem:
clients3.google.com/
apple.com/library/test/
captive.apple.com
connectivitycheck.android.com
connectivitycheck.gstatic.com
connectivitycheck.android.com/generate_204
clients3.google.com/generate_204
android.clients.google.com
It did not, phones are still being disconnected after about a minute if no Internet connection is made.
Is there anything else we can try? We are ultimately looking for a fix that won't require our users to do anything special.
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