This message appears when attempting to delete media (clicking yes), edit display profile settings (clicking save), when attempting to turn on debugging from report fault.
Unfortunately when I attempt to save that change into test mode the same error appears. Navigating away from the settings page, then back shows that the server remains in production mode.
I should have clarified. That screenshot is what appears when I browse to the web page that displays the login. I am unable to enter a username or password.
None of the links work either for Dashboard, About, Manual.