Please refer the VMware vCenter Converter Standalone 6.4 guide, on page 28 it clearly states the default port is 443. Only in case you're using non-default ports to connect to a remote source machine/ESXi host/vCenter Server/Converter Standalone server, you can enter a value for the port after the IP address or the FQDN of the respective machine. For IPv4, enter FQDN-or-IP address:port number.
Using VMware vCenter Converter Standalone 6.4 - vCenter Converter Standalone 6.4
So, this is suppose to work. For Windows, please use 'VMCE_HTTPS_PORT' cmd to set the HTTPS port on converter. The default is 443. Remote Converter Standalone clients connect to this port on the server and submit conversion tasks.