Change Domain Controller that is used by Exchange 2007

How do I change the domain controller that is used by my Exchange 2007 site?  I have multiple GC's in my organization, but when I look at the system settings, I only see one domain controller.
33031aAsked:
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tigermattCommented:

Exchange will automatically detect a DC and a GC to use when the services are started, and Exchange will continue to use that DC until either the services / server is restarted (so it will go and look for one again), or the DC becomes unavailable, when Exchange searches for a new DC after about 30 minutes.

If Exchange is detecting a DC in a site other than the local one, you first need to verify you have configured each site in Active Directory Sites and Services and associated each site with its IP subnet. Exchange 2007, unlike previous versions, uses the Active Directory information to select DCs, so it is crucial the sites are correctly defined and each site's DCs can be found within the appropriate site's 'Servers' container.

Bear in mind that Exchange REQUIRES a GC as well as a DC, so make sure at least one of the local DCs is also a Global Catalog server, otherwise Exchange will have to look in another site to get the appropriate data from another GC server.

-tigermatt
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33031aAuthor Commented:
Great answer.  I thought that this might be the case.
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tigermattCommented:

Thanks for the quick answer! I don't think I've ever seen an answer accepted much quicker on this site!

Matt
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sohailazCommented:
Hi,

I have two sites and 2 DCs in one site and 1 DC in other site.

All the DCs are Global Catalog and I have configured the Site & Services correctly and associated the subnet correctly.

My Exchange server is always connecting to site 2 instead of the local site and when I shutdown the DC in site 2 and restarted Exchange Server. Once the Server got restarted Exchange stopped working and it was not coming up even though the local DCs Gcs were up.

So I had to start the DC in site 2 and restart the Exchange and it started working again.

Advise pls.
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