Re: An error occurred while opening a virtual disk. Verify that the converter server and the running source machines have a network access to the source and destination ESX/ESXi hosts

Thanks for figuring that out!  Only problem is I'm not sure what you mean   how is something like that done?

*EDIT*  - Found it on the view window in Vcenter - view / administration / server settings / SSL

I selected the "verified" box at the top to apply to all the hosts and it now works.

Thank you very much!!!