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As part of a successful demotion process, the Dcpromo wizard removes the configuration data for the domain controller from Active Directory, but as noted above, a failed Dcpromo attempt might leave these objects in place.The effects of leaving such remains inside the Active Directory may vary, but one thing is sure: Whenever you’ll try to re-install the server with the same computername and try to promote it to become a Domain Controller, you will fail because the Dcpromo process will still find the old object and therefore will refuse to re-create the objects for the new-old server.

If its holding FSMO, require to seize fsmo role to other domain controllers. Run “select operation target”, and then run “list domains”. Run “select domain number”, where number is the number associated with the domain the server you are removing is a member of. Run “list sites”, and then run “select site number”, where number is the number associated with the site the server you are removing is a member of. Run “list servers in site”, and then run “select server number”, where number is the number associated with the server you want to remove. Run “remove selected server”, You should receive confirmation that the connection disconnected successfully.This can be done using ntdsutil as I showed you some time ago in this article .I will show you how to do that using Windows Server 2012 R2 Domain Controller but this is exactly the same procedure on previous servers.The entire risk arising out of the use or performance of the sample scripts and documentation remains with you.In no event shall Microsoft, its authors, or anyone else involved in the creation, production, or delivery of the scripts be liable for any damages whatsoever (including, without limitation, damages for loss of business profits, business interruption, loss of business information, or other pecuniary loss) arising out of the use of or inability to use the sample scripts or documentation, even if Microsoft has been advised of the possibility of such damages.

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