Greetings,
   I'm surprised that no one has hit this before, but, using zftp with a
proxy (one that requires an Account be sent) fails (for obvious reasons).
Here are patches against 4.2.6 and 4.3.4.

-- 
Peter A. Castro <doctor@fruitbat.org> or <Peter.Castro@oracle.com>
 	"Cats are just autistic Dogs" -- Dr. Tony Attwood