Problem is solved.
The java-cache blocks the site access. After clearing java cache the login screen was shown.
Make sure you include "/reporter" at the end of your URL when you connect. That is the correct way.
When the browser connects to the server, there is a handshake performed that may not work if you don't use the correct URL. Generally you don't need to clear the cache after upgrading since the client app will auto-upgrade. Downgrading to an older version does require you to clear the java cache.
Anyway, I'm glad you solved the problem.