The Session is not Authenticated

When using the VMware vCenter Converter Standalone tool, you may find that when you get to step 2 - 'Specify Destination', you sometimes get the error 'The session is not authenticated'. There are two possible fixes that I know of. First, try killing the vmware-converter-a.exe process from task manager. If that does not work, you are probably converting a live machine, so go to that machine and recycle the 'VMware vCenter Converter Agent' service.