From the Microsoft TechNet SCVMM TechCenter
Article URL: http://technet.microsoft.com/en-us/library/bb740860.aspx
(Don't forget the VMMCA tool. This should always be top in your troubleshooting list. More info here.)
The table below works as a quick reference for why you may be experiencing connectivity issues. This will at least get you off and running in the right troubleshooting direction!
You can use Host Properties dialog box to check the overall status of a host, the status of the agent that is installed on the host, and the status of the virtualization software that is installed on the host. These are important indicators of the operational state of a host. Should a host status indicate a need for attention, see the Troubleshooting Guide for System Center Virtual Machine Manager (VMM)
(http://go.microsoft.com/fwlink/?LinkId=83589 [ http://go.microsoft.com/fwlink/?LinkId=83589 ] ).
The host status values do not change in the VMM Administrator Console until the VMM server performs a refresh.
The following table describes the host status types and values.
Status Value and Definition
Overall host status
· OK—no issues exist with any host status.
· Needs Attention—a problem exists with one or more host statuses.
Agent connection status
· Responding—the VMM server is able to communicate with the agent.
· Not Responding—the VMM server is unable to communicate with the agent.
· Access Denied—the agent is no longer associated with the VMM server.
Agent version status
· Current—the version of the agent is up to date.
· Needs update—the version of the agent must be upgraded to match the version of VMM server.
· Unsupported—the version of the agent is not supported for any VMM functions.
Virtual Server service status
· Running—the Virtual Server service is started.
· Stopped—the Virtual Server service is stopped.
Virtual Server version status
· Current—the version of Virtual Server is up to date.
· Needs update—the version of Virtual Server needs to be upgraded.
· Unsupported—the version of Virtual Server is not supported for any VMM functions.
To view the status values of a host
1. In Hosts view, navigate to the host group that contains the host, and then, in the results pane, double-click the host.
2. In the Host Properties dialog box, click the Status tab.
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Not much help dude. So if you get an error such as indicated "Access Denied" what are you supposed to do?