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1. sudo apt-get install xinetd telnetd
2. sudo vi /etc/xinetd.d/telnet
service telnet
{
disable = no
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_failure += USERID
}
3. sudo systemctl restart xinetd
4. sudo systemctl status xinetd
5. sudo systemctl enable xinetd
6. sudo ufw allow 23/tcp
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