Red Hat Linux - Time is Running Out Published: Nov 04, 2003
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Telnet sends clear text passwords and usernames through logins and should be disabled on all web servers and replaced with SSH.

Telnet sends clear text passwords and usernames through logins and should be disabled on all web servers and replaced with SSH.
Some hosting providers are not disabling telnet by default but you should ensure that it has been turned off as it's a great security risk to your servers. TELNET server listens for incoming messages on port 23, and sends outgoing messages to port 23.

1. Login to your server through SSH and su to root.

2. Type pico /etc/xinetd.d/telnet

3. Look for the line: disable = no and replace with disable = yes

4. Now restart the inetd service: /etc/rc.d/init.d/xinetd restart

5. Turn off it through chkconfig as well because it can still start through that.
/sbin/chkconfig telnet off

6. Scan your server to ensure port 23 is closed.
nmap -sT -O localhost
Also run ps -aux | grep telnet and if you find anything other than "grep telnet" as result kill the process.

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Comments (5)

  • Gravatar - Bilal
    Bilal 20:09, November 26, 2003
    Ensim has announced that they will be releasing a new version of their Ensim Pro CP called 'Neo' - which will be based on RedHat Fedora Core 1.

    http://forum.ensim.com/showthread.php?s=&threadid=8596&highlight=Neo

    'mwu' the Ensim product manager details their plans there.
  • Gravatar - osfdeath
    osfdeath 22:35, January 16, 2004
    RedHat Fedora is now at level 1 (BETA) for cpanel :)
  • Gravatar - subramaniyan
    subramaniyan 08:36, August 2, 2005
    very wel website in the site
  • Gravatar - yuriy
    yuriy 14:57, August 8, 2010
    Hi, i'm using the same on my <a href="http://bitte.com.ua/">hosting</a>
  • Gravatar - kodas
    kodas 14:57, August 8, 2010
    Good host. bitte.com.ua

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