How to Disable Telnet access on server?

1. Login to your server as a root user.

2. Edit the file as follows:

# vi /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 ,then in that case kill that process.

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