Hi All, I hope you can help.
My Environment:
I'm running a Exch 2013 2 node DAG across 2 WAN separated AD sites, there are two client access servers on each site and we are part of a large single root forest with multiple subdomains. There are two domain controllers on each site, all DC's are global catalogs and the site and subnets are correctly configured and the right servers are showing in the right sites including the Exchange servers.
My Issue:
I noticed that running certain commands in the Exchange Management Shell for one site was extremely slow so I thought I'd check what they were running against.Get-adserversettings |fl showed me that it was using a DC and GC outside my subdomain which was odd. There are two DC's in site and many many more across my particular subdomain.
So I checked get-exchangeserver -status |fl and that showed the same output.
I also checked event ID 2080 in the application event logs but this showed correctly (In-site DC's are the two local DC's and Out-Of-Site showed the DC's at my other site on the other side of the DAG.
Over the last few days the Exchange AD Topology service has always reported correctly but the Exchange Management Shell has consistently reported different DC/GC's in different subdomains each time I've checked which concerns me. The CAS boxes on my other site always report the local DC/GC's to them. I know I can manually set a preferred DC but I'd rather it worked correctly.
My question is, what is Exchange actually using? I'm guessing it goes on the Exchange AD topology findings which are correct but why does my Exchange Management Shell on either CAS at that site never pick up the correct servers?