This may be related to the existing FTP proxy or HTTP proxy
problems, but there is an additional piece of information.
 Despite entering a port number and proxy host on the FTP
proxy form, the installer tries to do a proxy GET to the
FTP port on the proxy.  I noticed this since our proxy
server has tcp wrappers watching the FTP port and the
connection attempt was caught.

No matter what I put for a port value on the "Further
FTP Setup" form, it still tries to talk to the FTP port on
the proxy host.

Did that make sense?