To support this case we have added HTTP access to our FTP site using the URL http://ftp.gesn.com/ftp . What this means is that any Internet browser (Internet Explorer, Netscape Navigator, or whatever) can be used to download the FTP files but not to upload them. For most people this is sufficient.
If you find yourself needing to upload files to our FTP site from behind a firewall you'll need to use a client that supports "passive" mode. Anyone knowing of such a program is asked to let the rest of us know.