Server Matrix/The Planet experience network downtime Published: Mar 20, 2004
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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 (1)

  • Gravatar - Anonymouse
    Anonymouse 22:17, August 2, 2004
    Personally theplanet/servermatrix has been very professional and very quick and reactive to problems like this with more than 10+ servers on their network compared to the other host we utilize, houston we have had problems..

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