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Issues with demoting a DC from domain. 
 
When running DC Promo, I get the follow error: &quot;the directory service is missing mandatory configuration information, and is unable to determine the ownership of floating single-master operation roles&quot; 
 
FSMO has been transferred previously, using the AD snap-in referenced in this web link: <a href="http://www.elmajdal.net/win2k8/Transferring_FSMO_Roles_in_Windows_Server_2008.aspx" rel="ugc">http://www.elmajdal.net/win2k8/Transferring_FSMO_Roles_in_Windows_Server_2008.aspx</a> 
 
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=&lt;Failed Sever Name&gt;,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=&lt;domain&gt;,DC=&lt;domain&gt;,DC=&lt;tld&gt; 
 
I've tried remove the &quot;\0ADEL:cfa48360-9c4e-456b-82ca-eb6610a50b68&quot; 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.
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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.

Error demoting DC - missing mandatory configuration information

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