Из документации к модулю TCP:
> -- Цитата:
> Note: Certain operating systems (e.g. Microsoft Windows Server 2003) do not accept an empty string or just a port number as valid values for localAdr. Use the values "0.0.0.0:0" or "0.0.0.0:<port number>" (e.g. "0.0.0.0:2") instead.