Hello Peter, I'm having the same problem. When I start the appliance for the first time, it fails. Looking at the error message, it fails when trying to join the domain. If I leave all the domain stuff blank, the appliance finishes its install and becomes available for use (but then I can't use domain authentication). I'm running a Windows 2012 R2 AD Domain on vSphere 5.5.
Kind Regards,
Brett