Upgrading from Windows Server 2003 to Windows Server 2012? Read this

Quartz-1

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http://blogs.technet.com/b/askds/ar...indows-server-2012-r2-domain-controllers.aspx

We have been getting quite a few calls lately where Kerberos authentication fails intermittently and users are unable to log on...

Anyway, we’ve been getting more calls than normal about this lately, and that led us to take a closer look at what was going on. What we found is that there’s a problem that can manifest when you have Windows Server 2003 and Windows Server 2012 R2 domain controllers serving the same domain.
 
One should never have 2k3 and 2k12 DC's running together. 2k3 and 2k8 work perfectly together. But 2k3 ans 2k12 are a no-no.
 
The Hop Scotch method (2003 > 2008 > 2012) does work. It is actually pretty easy, just time consuming.
 
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