Can't add domain controller to existing domain

Brandon Fogliano 136 Reputation points

Hi All,

I have been digging through Google and trying fixes all day, I've never run into this problem quite this bad. I am trying to add another domain controller to my domain. There is only one currently and this is a 2012 R2 DC with the same being added. Here is the full error:

The operation failed because:

The Active Directory Domain Services Installation Wizard (Dcpromo.exe) was unable to convert the computer account CTG-HQ-DC$ to an Active Directory Domain Controller account.

Verify that the user running Dcpromo.exe is granted the "Enable computer and user accounts to be trusted for delegation" user right in the Default Domain Controllers Policy.

For more information, see the resolution section of

The error was:

"The specified network resource or device is no longer available."

This is what I have verified so far

  1. I can get through all of the screens to promote the DC, it fails on install
  2. On the current DC I have verified that the new server is in Active Directory in the domain controllers OU
  3. Verified that the group policy allows the admin account to enable the trust and the GPO is applying to the current DC
  4. In Sites and Services the server is under the site but the NTDS settings are missing
  5. I can ping the domain from the new server
  6. I can ping the DNS name of the current DC from the new server
  7. The current DC has the proper service records in DNS
  8. DCDIAG on the current DC is clear except for a warning

Anyone have any thoughts?

Active Directory
Active Directory
A set of directory-based technologies included in Windows Server.
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  1. Dave Patrick 426K Reputation points MVP

    Please run;

    Dcdiag /v /c /d /e /s:%computername% >C:\dcdiag.log
    repadmin /showrepl >C:\repl.txt
    ipconfig /all > C:\dc1.txt
    ipconfig /all > C:\dc2.txt
    ipconfig /all > C:\dc3.txt

    then put unzipped text files up on OneDrive and share a link.

  2. Dave Patrick 426K Reputation points MVP

    Might work through this one.

    --please don't forget to upvote and Accept as answer if the reply is helpful--

  3. Brandon Fogliano 136 Reputation points

    Looking into it now. Additional information. As I am trying to clean out all of the old DCs in DNS manager, once I refresh the screen their SRV, GC, LDAP records all start reappearing. Very confusing, they are not in ADUC, they don't have site records, they don't physically exist anymore, but they keep coming back. Even using NTDSUTIL can't connect to them because they don't exist.

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  4. Brandon Fogliano 136 Reputation points

    I already verified that the Admin account has this right and the GPO is populating to the current DC and it is applied via the results screen.

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  5. Dave Patrick 426K Reputation points MVP

    You can also start a case here with product support.

    --please don't forget to upvote and Accept as answer if the reply is helpful--