[gembin@localhost bin]$ sudo launchctl
Password:
launchd%
launchd% load -F /System/Library/LaunchDaemons/telnet.plist
launchd% exit
and now the telnet is enabled, try to test it.
[gembin@localhost bin]$ telnet localhost
Trying ::1...
Connected to localhost.
Escape character is '^]'.
login: gembin
Password:
Last login: Fri Jul 13 22:21:08 on ttys002