Ich hab jedes Logfile durchsucht um etwas brauchbares zu finden.
Ich poste mal 2 Ausschnitte aus Logs, ich weiss z.Z. auch gar nicht in welcher Log ich hierzu fündig werden kann. 
in der open-change.log.0:
2015-02-27T13:11:47,527+0100 ERROR [OXWorker-0000076] com.openexchange.usm.eas.delegate.BaseXMLDelegate.logError(BaseXMLDelegate.java:776)
<Undetermined USM Session> Server/Resource is temporary down or busy.
/var/log/univention/management-console-module-lib.log
27.02.15 12:19:59.390 DEBUG_INIT
27.02.15 12:19:59.392 MODULE ( ERROR ) : The specified locale is not available (cmdline: en_US.UTF-8)
27.02.15 12:19:59.872 MODULE ( WARN ) : Specified locale is not available (en_US.UTF-8)
27.02.15 12:19:59.872 MODULE ( WARN ) : Falling back to C
27.02.15 12:20:21.107 MODULE ( ERROR ) : Traceback (most recent call last):
File "/usr/sbin/univention-management-console-module", line 118, in <module>
notifier.loop()
File "/usr/lib/pymodules/python2.6/notifier/nf_generic.py", line 284, in loop
step()
File "/usr/lib/pymodules/python2.6/notifier/nf_generic.py", line 271, in step
not __sockets[ cond ][ fd ]( sock_obj ):
File "/usr/lib/pymodules/python2.6/univention/management/console/protocol/modserver.py", line 172, in _recv
self.handle( msg )
File "/usr/lib/pymodules/python2.6/univention/management/console/protocol/modserver.py", line 205, in handle
self.response( resp )
File "/usr/lib/pymodules/python2.6/univention/management/console/protocol/modserver.py", line 332, in response
if self._do_send( self.__comm ):
File "/usr/lib/pymodules/python2.6/univention/management/console/protocol/modserver.py", line 312, in _do_send
ret = self.__comm.send( self.__queue )
error: [Errno 32] Broken pipe
Der Error ist noch in diversen anderen Konfigs zu finden, z.B. management-console-module-services.log., deutet aber glaube ich nicht auf dieses Problem hin.
Firebug auf die Seite von der AppSuite brachte auch wieder den Kerberos Fehler:
language=en_US; JSESSIONID=1640079542669911288.APP1
{"error":"Kerberos ticket in session is missing. Pleasy try again.","error_params":["9d7504a9b55546a29e6ff908111dbcee"],"categories":"TRY_AGAIN","category":4,"code":"SES-0212","error_id":"1010638573-10950","error_desc":"Kerberos ticket is missing in session 9d7504a9b55546a29e6ff908111dbcee."} […]