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Unable to Demote Domain Controller: DCPromo Error


I'm getting the following error when trying to demote a DC
"The box indicating that this is the last domain controller for the domain <domain> is unchecked.  However, no other Active Directory domain controllers for that domain can be contacted."

I have transfered the 5 fsmo roles to the from the OLDDC to the NEWDC and checked this using the Netdom Query fsmo tool to ensure that the roles have moved to the NEWDC.

Now if I shut down the OLDDC then the NEWDC cannot access the Domain Security Policy - Access denied or computer unavailable, and also cannot access the Domain Controller Security Policy - access denied or computer unavailable

I also cannot access the \\domain\sysvol share if the OLDDC is not available.  

Somehow the OLDDC is still the "Default" if I can call it that and the NEWDC cannot access the GroupPolicies.   I have check all replication and settings but I'm at a loss

Any assistance will be greatly appreciated.  Hope there is enough info above


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1 Solution
Run Dcdiag and post result here

you change your new DC as global catlog server?

configure a domain controller as a global catalog server
mekhet30Author Commented:

Thanks - managed to sort it out.

The problem was with the sysvol and netlogon shares on the newdc that kept going unavailable.  The is a registry key to fix this issue.



As soon as I did that I was able to reshare the sysvol and netlogon and set the NEWDC DLS to active.

Neil RussellTechnical Development LeadCommented:
have the oldDC and the NEWDC had a chance to sync yet? If the sysvol is not accessible yet it may be the case that they have not.
Good Luck

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