DCPromo and vCenter - Demoting Server 2K3 drops hosts from vCenter

I recently promoted a new 2K8 R2 server to be a domain controller.  All of the roles were transfered to the new server, and I demoted the server 2k3 DC.  After that, vCenter started to lose the hosts connection.  One hosts was disconnected from vCenter right away and the other 4 followed.  Luckily I took a snapshot of the 2k3 server and reverted it.  After that was completed, I was able to reconnect the hosts.  What would I be missing that would cause this issue.  Thanks in advance for your assistance.
ICCNetworkAdminAsked:
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unsatiatedCommented:
Check what DNS server is configured in the ESX hosts as well.
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Kiran ChCommented:
Can you pls check that the DNS entires for the esx hosts are there in the new w2k8 DC?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You reverted a Domain Controller, from not being a DC to a DC, how is your Active Directory?

check communication between vCenter and the hosts, can you ping by hostname, and IP addresses, and also tracert by IP address?
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ICCNetworkAdminAuthor Commented:
I did check, and the ESX hosts have a DNS entry for the 2k3 server and our 2k8 DNS server.  I just now changed the DNS server from the 2k3 to the new 2k8 R2 server.  I will try the demotion again tonight.  Thanks for the responses.
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