If disabling SSL doesn't work, try adding a host entry for your destination esx host on your source machine.
Even if you have a correct DNS entry for the machine, create the host entry. This worked for me.
If you look in vmware-converter-worker log file and you see the following error:
GetManagedDiskName: Get disklib file name as vpxa-nfc://[SAN-Name] vmname/vmname.vmdk@ESXHostName.yourdomain.local:
the above fix should help you!