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Adding 2k8 R2 server DC to SBS2k3 Server

Posted on 2014-02-06
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Last Modified: 2014-02-06
I am trying to add a 2008R2 Server to a 2003 SBS network so I can make it a secondary DC. I will then kill the SBS and promote the 2008 Server to the primary.

1. I ran the adprep /forestprep on the SBS2k3. Then I ran the domain prep.
2. I joined the 2008 to the domain.
3. I then tried to run dcpromo.
4. The error message says, "to install a domain controller in this AD forest you must first prepare the adprep/forestprep". The adprep utility is available on the windows server 2008r2 installation media in the support\adprep folder.
5. I run it and it says I can't run adprep on a server that isn't an AD server. HELP!!
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Question by:aando
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by:Jullez
ID: 39840838
Hello,

You will have to run the prep on your SBS server, from the Server 2008 DVD

If you insert the 64bit version you will get an error, just click on OK and continue. Don't let it run the installation.


1. DVDdrive:\sources\adprep\adprep.exe /forestprep

At the ADPREP warning, type c and then press ENTER.

2. DVDdrive:\sources\adprep\adprep.exe /domainprep

you should be able to run dcpromo on server 2008 after that.
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Author Comment

by:aando
ID: 39840853
I did that and it didn't work. The forestprep said it finished and was successful.
 Will I have to reboot the SBS2k3? That is the only thing I didn't do.
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Author Comment

by:aando
ID: 39840855
When I ran the domainprep is said the Domain-wide information has already been updated.
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by:Jullez
ID: 39840874
Reboot sounds like a good idea
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Jullez earned 500 total points
ID: 39840887
SBS 2003 is 32 bit, 2008 R2 has both versions on the DVD. Did you run the 32 bit one?
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Author Closing Comment

by:aando
ID: 39840896
Knowledge base article I read had me run the one without the 32 behind it. I ran that and it installed like a champ. THANKS!
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Expert Comment

by:Jullez
ID: 39840903
Glad you have it working!
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