Error determining whether the target server is already a domain controller: The target server is already a Domain Controller.

I was trying to add a new Windows 2012R2 Domain controller to an existing Domain. I was using the GUI tools, may be I should do this with PowerShell the next time. After adding the AD and DNS role I went through the DCPROMO wizard dcpromoand kicked off the promotion. After a manual reboot I checked and all of DNS and AD seems to be working fine including replication. However, I’m still being prompted in the Server Manager to promote the server. When I do the following messages is displayed – “Error determining whether the target server is already a domain controller: The target server is already a Domain Controller.” After some research it looks like I’m not the only one, check out these posts. First thing always, run DCDIAG. The output only confirms that everything seems to be working. The solution seems to be to just disable/acknowledge the notification by clicking the “x” beside the task. Even after a reboot the notification doesn’t come up anymore.

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2 comments

  1. I had the same error message after promoting a Server in Microsoft Azure (separate AD Site) to a Domain Controller. I first also had some troubles with DNS (because of entries of the old AD Controller) and Sysvol was not successfully replicated to this server (got this trough DCDiag). After solving that, a few manual “Replicate now” on AD Sites and Services and 3 Reboots of the Server, this message disappeared from Server Manager by itself. I didn’t deactivate the message like RZM wrote. So I figure, you could solve that, but maybe in RMZ’s Case he should also just have rebooted the server one or two more times.

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    • If I remember correctly I did reboot the server at least once and checked the eventlogs and replication to see if anything was out of place. It appears the same steps to troubleshoot/check apply and this messages can be misleading.

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