EAP245 is not showing captive portal on Android
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I set up an external captive portal on my EAP245. It is working correctly on iPhone, but on Android devices it is not popping up the captive portal. As a result; they are not verified by our Radius server, they do not have access to the internet. But there's no possibility to get access to internet too as the captive portal is not shown.
I tried it on two different Android devices.
My settings are (please let me know if other screenshots are needed to give an answer);
5GHz is the same as 2.4GHz.
IP and URLs are correctly set. I also tried enabling 'HTTPS redirect'.
Line 1 is set to the IP address of the Radius server. Line 2 is set to the same value as 'External web portal URL' of screenshot 2. Line 3 is set to the IP address of the webserver where the web portal is located. Line 3 was needed to get it working on iPhone too (I really don't know why). Our portal server is showing a HTML page with CSS inline and all images as inline base64 encoded values.
No access point from any vendor can "show a captive portal" on a client device by itself. The WWW is a pull-medium, not a push-medium. As long as the user (or its device) doesn't request a web page, nothing will be sent from the web server.
What your iPhone does is a so-called network awareness test. If you connect the iPhone to a WiFi network, it will automatically send a HTTP request to an Apple server to see wether it has Internet access. If it gets a redirect to a portal page rather than the requested website as the answer, it will pull the portal page given in the redirect and display it.
An Android device does exacty the same — only difference is that it connects to a Google server for the test and that it does not immediately show the portal page being redirected to, but send a notification to the user requesting him/her to click on this notification to open the portal page (the message in the notification of following screenshot reads "Log into the WiFi network" in english):
Thus, showing no portal page on Android is error code 20cm, which means the problem sits 20cm in front of the screen.
It's not a setting in the AP or in the controller, it's just people not reading notifications (or turning them off intentionally).
BTW: to show a portal page on older systems without a network awareness test, just open a browser and request a web page of your choice using HTTP protocol (not HTTPS). The browser will redirect you to the portal page as long as you're not authenticated.