I wouldn't have imagined that in this day and age there would many servers out there still with an active telnet service but I do know that a few ADSL modems out there and the odd network attached device. If you run a server and you leave your servers wide open you are asking for trouble. I've learned my lessons the hard way as I blundered my way into setting up my own LAMP based webserver and leaving openings wider than the Grand Canyon. When you're 15, a little knowledge can me dangerous. To cut a long story short, a lot of data was lost and a lot of time was wasted getting thing back up and running. Dumb things I did included opening up telnet to the world, trivial passwords, same passwords used everywhere and allowing root to login from telnet.