Hello,
I recently demoted a Server 2008 DC from our one site (we have two in total) and received this message:
DCPromo was unable to remove DNS delegations from the parent zone: com. This could be because you do not have permissions to do so, or because the zone is hosted by a server that does not run windows. You should delete DNS delegations in the parent zone for this domain. To do so, contact an administer who is responsible for the DNS zone: com. The error was: The RPC sever is unavailable.
I went ahead and clicked ok however, now I'm running into issues with DNS and DHCP at this site. I have another DC at this site that's running Server 2012 that is now the active DNS and DHCP server for this site. I am unable to reach any of my shared drives or remote into other servers unless I hard code the DNS information into each client computer. If I don't, then I get a weird DNS server IP that isn't from our domain. As well, for the server that's running server 2012, when I open up the DHCP console, I get an APIPA address rather than the host name like I do for our other site. Furthermore, in the DNS console at the site in question, when I select properties for this subnet and select the name servers tab, I have 3 APIPA IP's for this DC for both forward and reverse lookup zones plus it's IP. Not sure exactly what I did but any help would be greatly appreciated. Please find below the environment in question. Thanks in advance!
- Single forest and single domain
- Two sites connected with an IPsec tunnel so that users can connect to Exchange and shared drives across the WAN
- The DC I demoted is running Server 2008
- The new DC which has been a DC since this past summer that is now a DNS and DHCP server is running Server 2012
- I have admin rights to all of the servers.