I exported again and found 4 warnings in even viewer .
Cache synchronization took longer than the specified CacheSynchronizationPeriod.
Even ID 202.
and error event after that is
A Kerberos error message was received:
on logon session
Client Time:
Server Time: 6:47:10.0000 1/2/2015 Z
Error Code: 0x7 KDC_ERR_S_PRINCIPAL_UNKNOWN
Extended Error: 0xc0000035 KLIN(0)
Client Realm:
Client Name:
Server Realm: SuperCS-CH
Server Name: MSSQLSvc/SERVER2012R2.Supercs-ch:1433
Target Name: MSSQLSvc/SERVER2012R2.Supercs-ch:1433@SuperCS-CH
Error Text:
File: 9
Line: 12c4
Error Data is in record data.