ovftool deploy failing with "Network connection was lost"

Hey,

Is anybody aware of what network flows exist when deploying an ovf file using ovftool through a vCenter?  Right now ovftool is continually erroring out with the following message:

Transfer Failed                      
Error: Network connection was lost.
Completed with errors

When watching on the vCenter I can see that the virtual machine is created but then it looks like data is never actually transferred.  So I know that the initial connection to vCenter is successful.

I'm guessing the initial connection happens with vCenter and then the data transfer occurs directly with the ESX.  Would be very appreciative if somebody could confirm this and identify the port that the data transfer happens on.

Thanks,

-Chris