11-04-2008
After I telnet somewhere I can do this:
$ tty
/dev/pts/4
$
/dev/pts/4 is a pty (pseudo-terminal) and telnetd must allocate one for a connection and the script program uses them too. You are out mostly due to 192.168.57.42 not properly closing connections. CLOSE_WAIT means a process on your end has closed a socket and now you waiting for a close from the other end. The other end is probably a PC that just reboots or powers off rather than closing a connection. You can probably tune your kernel to time-out the CLOSE_WAIT's but I don't know the specific for your kernel.
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LEARN ABOUT CENTOS
ftpusers
FTPUSERS(5) Linux Programmer's Manual FTPUSERS(5)
NAME
ftpusers - list of users that may not log in via the FTP daemon
DESCRIPTION
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 for improving security within a TCP/IP networked environment. It 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 ftpusers.
Format
The format of ftpusers is very simple. There is one account name (or username) per line. Lines starting with a # are ignored.
FILES
/etc/ftpusers
SEE ALSO
passwd(5), proftpd(8), wuftpd(8)
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2000-08-27 FTPUSERS(5)