@Shaun, Hi...My settings look similar to yours, and I can even successfully test the settings which confirms that the controller can connect to the AD, problems comes after I authenticate, it will say authenticated and then it goes to the same page for login (i.e. asks for the user name and password). But if I put the wrong credentials it will throws an error to say that the username or password is incorrect.
Nope, no firewall. Managed to get it to work, had to create Roles for the users and assign them using groups that the user belongs to in AD. Also had to specify the SSID that the user can access after authentication.