As mentioned in http://common-lisp.net/pipermail/users/2006-August/000006.html FTP will soon be going away on common-lisp.net. Your project showed up in a grep for ftp in your public_html suggests that you either store files in your ftp directory or that you link to files in FTP on common-lisp.net.

This email serves as a second notice that you'll want to update your links and move your files. Move them into your public_html directory and link to them there, Apache will happily serve them for you.

Thanks, Erik.