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Building Second Domain Controller at remote site

I currently have 2 sites setup with a VPN. At the main Site I have a PDC running Server 2008. I am at the remote site linked with a VPN and installed AD on a new 2008 R2 server. When I try to run DCPROMO and add to an existing domain, It can see the domain but fails and says I need to run "adprep /forestprep". I pop the 2008 CD in and run command and it tells me that "ADPREP cannot run on this machine because it is not an active domain controller"

This is my first time setting up a secondary DC off-site. What step am I missing?
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GMSMRM
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GMSMRM
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1 Solution
 
MetaltreeCommented:
You need to run adprep on the existing DC at the main site
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Sarang TinguriaSr EngineerCommented:
Refer below link on how to install first 2008 R2 DC in domain though in this link other is 2k3 DC still you may refer that how to upgrade schema


Adding first Windows Server 2008 R2 Domain Controller within Windows 2003 network
http://kpytko.wordpress.com/2011/08/25/adding-first-windows-server-2008-r2-domain-controller-within-windows-2003-network/
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GMSMRMAuthor Commented:
Metaltree,

Thanks that did get me past the adprep procedure. Another quick question. During DCPROMO while adding the RODC, I recieved and error "an ldap connection could not be established with the Active Directory Domain Controller", any ideas here?
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GMSMRMAuthor Commented:
This was the missing step I needed. Thanks.
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