Virtual Lab – Application group failed to start – running ping test(s) failed

In order to test some major changes to a SharePoint environment I started a SureBackup job using a virtual lab.  The lab contains a domain controller, SharePoint 2010 application server and SQL server.  I started the job and it failed the ping test for the domain controller:

Error: Application group failed to start

The server was up and running and I could log onto it using the console, so figured here must be an issue with networking.  After a bit of messing around it became apparent that the Virtual Lab network used by the VM was not configured on the host it was using (there are many hosts in the cluster).  Simply adding the network to the host solved the problem, I restarted the SureBackup job and it passed the ping test instantly.