ssl:ip[:port]
    The specified port on the host at the given ip, which must be expressed as an IP address (not a DNS name) in IPv4 or IPv6 address format. Wrap IPv6 addresses in square brackets, e.g. tcp:[::1]:6653. For ssl, the --private-key, --certificate, and --ca-cert options are mandatory.

    If port is not specified, it defaults to 6653.

unix:file
    On POSIX, a Unix domain server socket named file.

    On Windows, a localhost TCP port written in file.