pssl:port[:ip]
    Listen on the given SSL port for a connection. By default, connections are not bound to a particular local IP address and it listens only on IPv4 (but not IPv6) addresses, but specifying ip limits connections to those from the given ip, either IPv4 or IPv6 address. If ip is an IPv6 address, then wrap ip with square brackets, e.g.: pssl:6640:[::1]. The --private-key, --certificate, and --ca-cert options are mandatory when this form is used.

ptcp:port[:ip]
    Listen on the given TCP port for a connection. By default, connections are not bound to a particular local IP address and it listens only on IPv4 (but not IPv6) addresses, but ip may be specified to listen only for connections to the given ip, either IPv4 or IPv6 address. If ip is an IPv6 address, then wrap ip with square brackets, e.g.: ptcp:6640:[::1].

punix:file
    On POSIX, listen on the Unix domain server socket named file for a connection.

    On Windows, listen on a kernel chosen TCP port on the localhost. The kernel chosen TCP port value is written in file.