No Comm. indicates
that VM Manager is unable to communicate with the WBEM provider running
on a virtual machine. Hover the cursor over the meter to display an
exception error message identifying the problem.
A common
reason for the No Comm. label to
be displayed is a problem with trusted certificates. For example,
if the parameter is set but the keystore on the host does not trust
the certificate from the virtual machine, then the certificate is
not in the keystore, has expired, did not match the virtual machine
name, or is otherwise invalid.
If the WBEM Provider is unresponsive, you might need to restart
it.