Are you experiencing one or more of the following symptoms:

• ESX Server shows as Not Responding in VirtualCenter
• ESX Server shows as Disconnected in VirtualCenter
• Cannot connect ESX Server to VirtualCenter
• When attempting to add an ESX host to VirtualCenter, you see an error similar to:
  Unable to access the specified host, either it doesn't exist, the server software is not responding, or there is a network problem