I have a single exchange 2007 box with all the roles installed. The subnet it is located on has two domain controllers, lets say DC1 and DC2. DC1 is master of all active directory roles. Recently, DC1 went down for a while. This completely stopped all exchange services. I couldn't even login to the exchange 2007 box, it said domain controller not found. OWA, outlook anywhere, everything stopped. Why wouldn't exchange read information from DC2, which is in the same subnet?????? I understand the PDC emulator is down, but I don't see how that should completely stop all of exchange 2007 services. What can I do to fix this?

Your second DC is most likely not configured as a Global catalog server. Exchange relies heavily on global catalogs.Configure a New Global Cataloghttp://www.petri.co.il/configure_a_new_global_catalog.htmIn the Exchange Management Console, select Server Configuration. Properties, System settings. Here you'll see which domain controllers and global catalogs are used by Exchange. MCTS: Messaging | MCSE: S+M | Small Business Specialist

Hi Andy, Please check the 2080 event on the Exchange 2007. Whether the Exchange server is able to detect the second DC? Event ID 2080 from MSExchangeDSAccess http://support.microsoft.com/kb/316300/en-us ~~~~~~~~~~~~~~~~ Mike Shen TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com ~~~~~~~~~~~~~~~~

The DC is configured as a global catalog server.

Hi Mike, Yes, the following is located in the event log: In-site: ash-dc-1.hq.XXXX.com CDG 1 7 7 1 0 1 1 7 1 ASH-DC-2.XXXX.com CDG 1 7 7 1 0 1 1 7 1 I also went to Organization Configuration, clicked Modify Configuration Domain Controller, and chose just the domain and left the checkbox blank for configuration domain controller. From what I understand, this should tell it to use any available domain controller. With this setup, my e-mail should still function if I lose DC-1, correct?

Hi Andy, Looks like the second GC is detected and good.Would you please run Get-ExchangeServer |fl name, static* to check whether any static DC, GC or ConfigDC is configured?In addition, please let me know whether the Exchange Server is installed on DC or installed separately? If Exchange Server is running on a domain controller, several Exchange Server directory components, such as Directory Service Access (DSAccess), Directory Service Proxy (DSProxy), and the Message Categorizer will not fail over to any other domain controller or global catalog server.For your reference:Directory service server detection and DSAccess usagehttp://support.microsoft.com/kb/250570/en-usThanks,Mike

Hi Mike, I ran the command and it didn't show any of those configured (all came back blank) Exchange 2007 is not on a domain controller. My other concern is, I want to transfer all the roles from the old DC to the new DC. Should exchange continue to work without any outages if I transfer all the roles to second domain controller? I will open a maintenance window and try and reproduce the problem and post some error logs. What I will do, is shutdown the DC1 (which has all 5 master roles), and see if exchange stops working again (as it did before) I will then bring it back up and see what I can dig out from the logs.

Please confirm have to put the secondary DNS as DC2 or changed the DNS when DC1 was down to the DC2 that was active.(Exchange machine DNS I ment) Ripu Daman Mina

Yes, the second DC is listed as secondary DNS.

Ok, what is the next step?

Any update on this, I have a similar issue