Install lsof and find out what is actually using that port.  Then kill
the process.  I don't run telnet, but I do run SSH.  Here's an
example:

lsof -iTCP:22

COMMAND  PID USER   FD   TYPE DEVICE SIZE NODE NAME
sshd    2621 root    3u  IPv6   5928       TCP *:ssh (LISTEN)

To kill the process, all you have to do is "kill -9 PID".

Good luck.
-- 
Chad Walstrom <chewie at wookimus.net>           http://www.wookimus.net/
           assert(expired(knowledge)); /* core dump */