How to configure Telnet on Free BSD OS.

Enable Telnet (Not Recommended):

Navigate to /etc/inetd.conf . find two lines same as below:

#telnet stream  tcp     nowait  root    /usr/libexec/telnetd    telnetd
#telnet stream  tcp6    nowait  root    /usr/libexec/telnetd    telnetd

Please delete the liftmost # of theirs.

Navigate to /etc/rc.conf . add below line to the end:

inetd_enable="YES"

Permit root login from telnet clicent (not recommended):

Navigate to /etc/pam.d/login . find a line like below:

account required pam_securetty.so

Please add # to the liftmost of this line, like this:

#account required pam_securetty.so 

Rebbot the machine

Work done!