Provided by: ftpd-ssl_0.17.33+0.3-1build1_amd64
ftpusers — file which lists users who are not allowed to use ftp
/etc/ftpusers is used by ftpd(8); the file contains a list of users who are not allowed to use the ftp command. For security reasons at least users like ``root'', ``bin'', ``uucp'' and ``news'' should be listed in this file. Blank lines and lines beginning with `#' are ignored. Note: a lines with `#' in the middle is not a comment. Don't put `#' after a name to comment it; use another line, or things will silently fail on you.
/etc/ftpusers might contain the following entries: # # /etc/ftpusers # root uucp news