Can anyone give me an idea if a process, in this case Symantec AV server
software running on an XP workstation, will be able to connect to
Symantec's FTP site and pull down new definitions? So far as I am able
to tell by experimentation, it works fine if I"m logged in and, even
though I have supplied a username and password to the appropriate spots
in the Symantec software, it doesn't work.

We are running the standard http proxy but FTP goes out via filter
exceptions to the best of my knowledge.