ftpusers - list of users that may not log in via the FTP daemon
The text file ftpusers contains a list of users that may not log in using
the File Transfer Protocol (FTP) server daemon. This file is used not merely
for system administration purposes but also for improving security within a
TCP/IP networked environment.
The ftpusers file will typically contain a list of the
users that either have no business using ftp or have too many privileges to
be allowed to log in through the FTP server daemon. Such users usually
include root, daemon, bin, uucp, and news.
If your FTP server daemon doesn't use ftpusers, then it is
suggested that you read its documentation to find out how to block access
for certain users. Washington University FTP server Daemon (wuftpd) and
Professional FTP Daemon (proftpd) are known to make use of
The format of ftpusers is very simple. There is one account name (or
username) per line. Lines starting with a # are ignored.
passwd(5), proftpd(8), wuftpd(8)
This page is part of release 5.05 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the latest
version of this page, can be found at https://www.kernel.org/doc/man-pages/.