We have a single 2013 multi-role Exchange server in our environment. I have noticed that whenever a single DC goes offline I lose connectivity to Exchange. When I look at the services on the Exchange server i see that EXCHANGE 2013 AD Topology Service has crashed. The specific server that causes this is a DC / GC in a different site. It holds the domain naming master role. There is a DC/GC in the same site as the Exchange server. The domain is at 2008r2 functional level. Please let me know if there is anything else I have omitted about my environment that is pertinent to answering this question.
Thank you
Jim