I've gotten some tickets from users who are attempting to access our captive portal SSID, and when the CP redirect occurs they are sent to https://www.google.com. When this happens, they get a cert error and cannot proceed to the logon page unless they attempt to go to an http page instead. It appears that Google Chrome has removed the ability to set a homepage manually in version 51.0.2704.81. It seems in this new version the default page when opening a new tab is https://www.google.com or a blank page showing your most recent/viewed pages.
I see there is an option under the Authentication -> L3 Authentication -> Captive Portal section called "Use HTTP for authentication".
I am wondering if enabling this feature would solve the above scenario. Short of telling users to use a different browser, that is.