Kerberos single sign on - where is my error

[thorsten]

OK, I managed to join my Windows 7 desktop machine to my fresh created Zentyal domain server with AD.

Next, I managed to set up the DHCP system, so the IP (and even the network name) is transferred correctly.

Now I turned on "Enable Single Sign-On (Kerberos)" for Zarafa, but it keeps asking me for a user / password which is already locked in - and yes, I did type in the password correctly (you can not really misstype the combinatiion "test" / "1234"; "test" / "test" or "fooo" / "barr")

I am wondering if this is somehow related to my ongoing Radius issues? http://forum.zentyal.org/index.php/topic,13580.0.html

Also, when I turn on "Enable Single Sign-On (Kerberos):" for Proxy setting the proxy server manually to my server name (e.b. Ebb-S01.abc.dyndns.org), Firefox AND Internet exprorer refuse to show any internet access as Zentyal blocks everything - but the user is logged in ..... and I did not create any rule...

So - any Idea on what I might have done wrong?

THX
Thorsten