Problem with "Messages" under 10.8.2

Hello!

Since the upgrade to MacOS 10.8.2 Messages is unable to connect to the Messages Server.

I get the Note that the Server is having some problems and that i should try again later.

(Exact German Error Message is:

Anmeldung bei iMessage fehlgeschlagen.

Der Server meldet einen Fehler bei der Verarbeitung einer Anforderung.

Versuchen Sie es später erneut).

Ok, i tried again later (over the last few days) as told in the error message.

I changed my Apple-ID password, i also deleted the Messages Preferences to set it up from scratch

and i checked all security settings with no lead, how to get it to work.

As it worked well with 10.8.1 (and nothing has changed besides the OS upgrade)

i finally downloaded the combo update 10.8.2 today and overinstalled with no change of the problem.

It also cant be a an Apple-ID issue because Messages works and syncs quite well using my Apple-ID on

iPod Touch (2nd), iPad2 and iPhone5. I also tried Bonjour and AIM Accounts on 10.8.2 Messages,

wich works as desired.

Has anybody an idea?

Thanks!

Frank