VMS Help TCPIP Services, FTP, Exiting FTP  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    You can end an FTP session and return to the DCL prompt with any
    of the following commands: EXIT, quit, or Ctrl/Z. The following
    examples close the connection with the remote host, if one is
    open, and exit FTP.

    FTP> EXIT
    221 Goodbye.
    $

    FTP> quit
    221 Goodbye.
    $

    If however, you want to close a connection while remaining at the
    FTP prompt, use the DISCONNECT or close command.

1 - Examples

    The following examples close a connection, if one is open, and
    remain at the FTP prompt for you to continue using FTP.

    FTP> DISCONNECT
    221 Goodbye.
    FTP>

    FTP> CLOSE
    221 Goodbye.
    FTP>