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Active Directory 2003 to 2012 Migration

Last Modified: 2015-10-23
My environment consists of two Windows Server 2003 DCs and I am looking to migrate to a Windows Server 2012 AD.
I started by adding a Windows Server 2012 DC, however,  I have seen some errors in the following:
- In the system log on the 2012 DC I have seen a few 5722, 5723 and 5895 errors.
- Periodically there are very high logon times when logging on to the 2012 DC.
- The BPA on the 2012 DC indicates that the zone _msdcs is not available even though I see it in the DNS management console.
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