Current installation. 4 Exchange 2013 machines on Server 2008 R2 platform (VM with Hyper-V), all have CAS and mailbox role installed. DAG across all for servers. 2 servers
reside in main datacenter and 2 on a DR site.
The Exchange installation is at CU 2 and working.<o:p></o:p>
We have 2 domain controllers in the main datacenter (win 2008 R2) and 2 domain controllers in the DR site (Win 2012 R2).<o:p></o:p>
DCDIAG checks out fine on all. Network is fine for all.
Running SP1 installation on the Exchange servers in the DR site results in prerequisites in a bunch of errors which all stem from one root issue: <o:p></o:p>
Error:
Either Active Directory doesn't exist, or it can't be contacted.<o:p></o:p>
Running the same on the main site (DC= Win 2008 R2) completes prereq for SP1 with no errors.
So the difference is that the 2 Exchange servers on the DR site have Win 2012 R2 for their domain controllers and fail.<o:p></o:p>
Any advise?<o:p></o:p>
Gerhard Waterkamp ACSLA Inc.