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Two DCs with the same domain name but never join eath other

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Last Modified: 2012-05-07
One of my clients used to have two windows 2003 Domain Controllers and they were in the different locations. Both DCs  have the same domain name but they don't join each other (e.g. DCa and DCb are the same name mydomain). Now, they close one of the offices and move DCb to the DCa office. The DCb also has Exchange 2003 installed. What is the best way to make them work together?

1. If they demote the DCb server and join in the DCa, does the exchange need to re-install?
2. I assume if they demote DCa and then join it in the DCb, the exchange should work, but we need to rejoin all workstations. Right?

Or any better options?
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Lee W, MVPTechnology and Business Process Advisor
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Commented:
> You can demote a DC with Exchange on it if there is another DC on the *same* domain.

Datedman - What are you talking about - you break exchange doing that!
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Commented:
Nope leew, I demoted an exchange server right here on my own domain.  Was a DC, isn't anymore.  Nada problem in my experience.  ofc i never read up on it beforehand so if you say it's strictly verboten i'll believe ya...well, long enough to try it again in a vm for the heck of it. :)  Can't unjoin the domain but haven't had any problem with un-dc'ing it.

Commented:
Oh hmmm did smith, did you mean that they both have exchange or that only DCb has exchange?  My have misread your post.  How many workstations (that are active) are in each domain?
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Commented:
If you ran DCPROMO on an Exchange server and Exchange worked correctly, then you were lucky. It is not supported by Microsoft and will usually result in Exchange failing. On that basis it is not something that you should be suggesting to others to do. That is basically the same as saying that you crashed your car in to a tree, walked away and telling everyone else that they can do the same thing because you have done it once or twice before.

Simon.

Commented:
OK i just read up and now i remember having to deal with changes in the IIS accounts etc.  Like  I said *cough cough*, leew and mestha are completely correct!  Anyway fortunately in this case it doesn't mean too much because either he's going to have to ditch one of the domains entirely to put the two machines on one domain.

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Commented:
Thank you for all inputs. We re-installed teh DC and Exchange.
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