I've got some Android version 9 devices that are not opening the captive portal page on our public WLAN. Once connected to the SSID, it prompts that a sign-in is required, but it then opens a page to "connectivitycheck.gstatic.com", displays a blank screen and fails to complete the webauth.
I've read that I can create DNS entries for "connectivitycheck.gstatic.com" to point to a non-routable IP address to force Android to redirect to the captive portal, but I'm not sure how to do this in the WLC.
