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On running ADPrep passes all prerequisite, but fails in the last stage with the below error:

ADPrep execution failed --> System.ComponentModel.Win32Exception (0x80004005): A device attached to the system is not functioning.

ADPrep log says:

Adprep requires access to existing forest-wide information from the schema master in order to complete this operation.

I'm using the credentials of Enterprise Admin (schema admin too) couldn't find why it still throws access denied error.

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Well, where is your schema master? –  HopelessN00b Apr 1 at 4:32
    
Its Server 2008R2 which is GC in 2008R2 forest level. –  Nandan Apr 1 at 4:44
    
Check domain integrity - can be you lost the schema master at some point in the past and never bothered to reassign it? Was there another DC once, time ago? –  TomTom Apr 1 at 4:51
    
Yes there seems to be no problem there..For urgency after 2012R2 failed i have successfully installed another additional 2008R2 which is working fine that shows no problem in Schema or domain integrity. Problem is only with making 2012R2 an additional domain controller. Currently I have below DC's 1 2008R2 -GC,Schema Master the Default. 2.2008R2 -Additional DC (to be removed after 2012R2 come up) 3.2008 -RODC –  Nandan Apr 1 at 5:09
    
Can you try to run ADPrep on the schema master manually? (pleaes back it up first!) –  MichelZ Apr 1 at 6:42

1 Answer 1

I'd comment on the original question so I can gather more info before posting my answer, but I don't have enough reputation yet as I'm new; go figure right :)

Anyway, I've ran into this twice for two different clients, one that was running SBS 2003 and another running 2008 R2 like you are. Both times had a few different tweaks but ultimately the solution turned out to be this:

  1. Remove the Active Directory Domain Services role from the 2012R2 server if you have already installed it.

  2. Reboot.

  3. I know you already said you had Enterprise and Schema rights, but make sure you're using an account with Enterprise, Schema, and Domain admin creds.

  4. Reboot the 2008 R2 DCs; yes all of them.

  5. Go to the 2012 R2 server and add the Active Directory Domain Services role and reboot after it successfully adds.

  6. Once logged back into the 2012 R2 server open Server Manager and on your post installation tasks you should see something similar to this screenshot: enter image description here

picture source: http://blogs.interfacett.com/wp-content/uploads/2013/02/015-promote-domain-controller-server-2012-add-a-child-domain-ad-ds.png

click on the link "Promote this server to a domain controller" (ADPrep (both forest and domain) will run automatically without manually needing to have you run it from a command prompt)

  1. Reboot the server once the dcpromo finishes.

If you are still having trouble please look for the value in ADSI Edit for your server entitled "ClaimIsValueSpaceRestricted"; it will either be true or false. Let me know if it's true or false and if it's greyed out or not. We can troubleshoot further should we need to, but steps 1-7 should resolve your issue.

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Brad, i have already done all your 6 steps. I get the exception in ADPrep and never completes. –  Nandan Apr 21 at 10:01
    
I don't know if you can, but can you add a 2012 (non-R2) server and add it as a DC without any issue? –  Brad Bouchard Apr 21 at 17:08
    
Also, what about the ADSI Edit value I referenced, did you look at it? –  Brad Bouchard Apr 21 at 17:09
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I didn't yet chenked a non R2 server yet as it was not my intention to build 2012(non R2), though its not a bad idea. It did failed in step 6 with the same old error "DPrep execution failed --> System.ComponentModel.Win32Exception (0x80004005)" –  Nandan Apr 22 at 11:50
    
I coudnt find this attribute in ADSI edit! Sorry can u pls help where to look at? –  Nandan Apr 22 at 11:51

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