The following reply was made to PR pkg/47054; it has been noted by GNATS.
From: Robert Elz<kre%munnari.OZ.AU@localhost>
  Looks suspiciously like NAT death&  EPSV - an FTP server&  client that
  understand (and use) EPSV (or EPRT) separated by a NAT that has no
  idea what those are about (though as it is now close to 15 years since
  they were added, such a thing is really inexcusable - but they certainly
  exist).
  You could try disabling EPSV in the client, and see if that helps.
  Otherwise, try a tcpdump of the connection, and see what is really
  happening.