Library /sys$common/syshlp/tcpip$ftp_help.hlb DISABLE, PORT_COMMAND  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Turns off the sending of the PORT FTP command to the remote FTP
    host.

    By default, FTP sends a PORT protocol command when establishing a
    connection for each data transfer. If the PORT command fails, FTP
    uses the default data port (20).

    Disable the PORT command when communicating with certain FTP
    implementations that ignore PORT commands.

    DCL-Style Format

      DISABLE PORT_COMMAND

    UNIX Style Format

      sendport