problem checking the certificate

Hi

I have tow vCenter server added to my product list in vCloud Usage Meter 3.5 Build 4359663.

Both has becom in the inactive list. If i try to re-activate the host i get the error:

There was a problem checking the certificate for vcenter01.name.local:443. Unexpected exception: java.net.UnknownHostException: vcenter01.name.local

There is no button to delete the host. How can I solve this?