when user successfully logs in (either after registration or login) then hitting back button shows KC page (login/registration) again.

This looks to be a bug to me because user is logged in and should be allowed to do only logout. No login or registration.

I tried how google.com behaves and when you successfully logs in then hitting back button is handled correctly - their sso realize that you’re logged in and then user is redirected to requested page. No login page.

I think KC should follow same behavior.

Jira for login flow: https://issues.jboss.org/browse/KEYCLOAK-2768

Jira for reg. flow: https://issues.jboss.org/browse/KEYCLOAK-2740

Thanks,