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.