Because Telnet is generally closed, you can do it, you can do this:
First modify /etc/xinetd.d/telnet to change disable = yes to no
The first method: # / sbin / service xinetd restart
Second method: # / etc / init.d / xinetd reloads reload profile
Run / usr / sbin / ntsysv in the character interface, select Telnet or direct setup, select Telnet service, determine
If you can't Telnet at this time, it will illustrate the fire wall elements, you can choose to minimum.