If the vCloud Director agent on an ESX/ESXi host cannot be contacted, try to repair the host.
- Click the Manage & Monitor tab and click Provider VDCs in the left pane.
- Right-click the provider virtual datacenter name and select Open.
- Click the Hosts tab.
- Right-click the host name and select Repair Host.
vCloud Director repairs the host. This operation affects all provider virtual datacenters that use the host.