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<blockquote>Our Domain controllers were two of those servers.</blockquote><br>how do you have this setup?<br>there are certain things like application servers that, when being replicated to DR, can failover and be usable<br>domain controllers don't quite function that way<br>knowing how things are setup will help<br>do these domain controllers replicate with each other between the sites?
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arnold

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I have asked the client. <br><br>Is this something to do with FSMO roles?<br><br>
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What was done with FSMO roles? <br>It will help to know what happened. Did DCs get turned on at the DC site? Were backups/replicas restored at DR? Were FSMO roles seized?<br><br>Note: Don't ever seize FSMO roles unless the original DC is permanently unavailable. If you seize a FSMO role, the original DC that had the role can NEVER be brought back online safely. It needs to be wiped out and forcibly deleted from the domain.
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Member_2_8329944

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<p>We have a big issue with our domain.<br id="isPasted"><br>Last &nbsp;weekend we had a building power down at our main site which is also our primary DC.<br><br>To get certain services running we had to fail certain servers over to DR. Our Domain controllers were two of those servers.<br><br>PDC<br>London</p><p>Kent<br><br>DRDC</p><p>Surrey</p><p>Hampshire<br><br>After the power down we failed back our PDC’s. Initially there were some issues but our services came back to normal after a few reboots.<br><br>Today we’ve gone in to look at DNS and the trusts and it seems some domain controllers aren’t communicating with each other. Some are seeing different servers as the PDC.<br><br><br></p>
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We have a big issue with our domain.
Last  weekend we had a building power down at our main site which is also our primary DC.
To get certain services running we had to fail certain servers over to DR. Our Domain controllers were two of those servers.
PDC
London
Kent
DRDC
Surrey
Hampshire
After the power down we failed back our PDC’s. Initially there were some issues but our services came back to normal after a few reboots.
Today we’ve gone in to look at DNS and the trusts and it seems some domain controllers aren’t communicating with each other. Some are seeing different servers as the PDC.

Windows Server

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.