Using the installer from Raw Hide 1.3.2 I had a couple of
problems with ftp during an upgrade from RH 5.2.

Start doing the install, select your packages.  Take more
then 15 mins (900 seconds) default timeout for closing an
anonymous ftp install.  Now continue install.  Crash,
reboot, start over.

Next time through.  Select all packages within 900 seconds.
Start installing, have a package missing (in my case it was
redhat-release-5.9-2.noarch.rpm, shouldn't have wanted this
file, but oh well.).  Wait 15 minutes before continuing, so
the ftp connection is closed (gone for food).  Continue
install (either try to get the file again, or skip it).
Crash, reboot, start over.

Next time:  Let it calculate the packages to install, and
install them.  Problem is that before the last crash the
packages that it upgraded (do not get upgraded again), the
old versions were not removed from the rpm database, hence
get dual entries in database.

Final solution: rpm -Uhv --force `cat listing'  :-)

One other little thing.  During anonymous ftp, login as
rhinstall instead of root, it is much nicer for tracking
things in my log files (may already be changed).