Last week I had a virtual SBS 2011 server become corrupt due to a hard drive redundancy issue. On that server I have many roles installed including AD. That server acted as our primary domain GC server. I also had a backup domain controller that was also a GC. When I restored the virtual server from a previous export approximately two months ago it could no longer speak to the AD domain that was still running. To get the computers to talk to the restored server which held file shares I had to shutdown the backup DC and rejoin some of the computers to the "new" domain. I just attempted to demote the backup dc that's off the network and re-promote it as the backup GC for the "new domain." I ran dcpromo and stated that this domain was the last in the forest. I went through the prompts and it came up to a screen stating: "The operation failed because: This Active Directory Domain Controller is not the last AD DC in the domain. The server is unwilling to process the request."
Does anyone know how I can demote the backup domain controller or how to fix this problem?
Thanks in advance