LSA and GroupPolicy Error-Events on 2012 DC after dcpromo

Hi All

I have started to migrate my domain controllers from 2003-R2 to 2012.
My first 2012 DC now has some error's in eventlog. I am unsecure if this is a problem or not.

First i got Event-ID 40961 vom LSA:

Log Name: System
Source: LsaSrv
Level: Warning
Event Source: LSASRV
Event ID: 40961
User:  SYSTEM
Computer: DC12.domain.com
Description: The Security System could not establish a secured connection with the serverldap/dc12.domain.com/domain.com@domain.com.  No authentication protocol was available.

Immediately after this Event i got a Event-ID 1006 from GroupPolicy:

Log Name: System
Source: Microsoft-Windows-GroupPolicy
Event ID: 1006
Level: Error
User: SYSTEM
Computer: ComputerName
Description: The processing of Group Policy failed. Windows could not authenticate to the Active Directory service on a domain controller. (LDAP Bind function call failed).
Details: SupportInfo1: 1, SupportInfo2: 5464, ErrorCode: 49

The GroupPolicy Event then repeats every ~5min. The LSA Event every ~1h.

At this time i have a co-existance of two 2003-R2 DC's and one 2012 DC.

Any Ideas or Solutions?

Thanks

Gargamelius