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  • I have 2 Domain Controllers in my company.
  • DC1 Primary is W2008 R2 [added recently],
  • DC2 is W2003-R2 , Its a single label domain named ABC

Yes I know that Microsoft recommends to use at least 2 or more name parts but this is old network running hundreds of workstation & servers since long & AD 2008 is introduced recently. W2003 base DC is still functioning as secondary/backup dc along with WDS. As AD design, users sometimes login to DC1 and sometimes to DC2 fine all working good.

Now as a part of disaster recovery plan , I have to restore the DC in test lab. I installed windows 2008 R2 in isolated VM, and started DCPROMO , but getting error 'single label domain' on name the domain section as MS KB states that

Windows Server 2008 R2 DCPROMO prevents the creation of new Active Directory domains with single-label DNS names.

How can I overcome this issue? How I will restore AD in case of real disaster ? any recommendation what path to follow?

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Why are you creating a new domain (dcpromo)? All you need to do is restore DC system state and the domain will exist.

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  • ok, to restore DC from backup (in fresh w2008) i dont need to run the dcpromo first? just restore directly?
    – Syed Jahanzaib
    Jan 11, 2018 at 3:34
  • correct; just restore. If your backup software supports "bare metal recovery" you might not even need to install Windows first.
    – CGretski
    Jan 29, 2018 at 12:52

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