Error demoting DC - missing mandatory configuration information

Issues with demoting a DC from domain.

When running DC Promo, I get the follow error: "the directory service is missing mandatory configuration information, and is unable to determine the ownership of floating single-master operation roles"

FSMO has been transferred previously, using the AD snap-in referenced in this web link: http://www.elmajdal.net/win2k8/Transferring_FSMO_Roles_in_Windows_Server_2008.aspx

However, I did note that the Infrastructure Master in the ForestDNSZones has an orphaned entry for a failed DC which was forcefully removed. ADSI Edit shoes the entry as:
CN=NTDS Settings\0ADEL:cfa48360-9c4e-456b-82ca-eb6610a50b68,CN=<Failed Sever Name>,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=<domain>,DC=<domain>,DC=<tld>

I've tried remove the "\0ADEL:cfa48360-9c4e-456b-82ca-eb6610a50b68" string on the NTDS Settings completely and changed the server name to the right server but to no avail. Should I be changing the NTDS Setting and what should I cange the \0ADEL into? What does it mean?

Seems there some metadata lingering around but not sure where else to look. Any help would greatly be appreciated. Thank you.
dave558Asked:
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dave558Connect With a Mentor Author Commented:
Okay, you don't require the string for the NTDS settings.

Turns out there was an orphan entry also in the DomainDNSZones, I've removed and demote the unnecessary domain controller.

Out curiousity though, what should the NTDS Settings be anywhere? It appears to be the unique identifier of the server but what's the \0ADEL part of the settings?

Cheers.
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dave558Author Commented:
Fixes the problem
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