I am a newbies in unix hope you can understand the way i ask since am not
totally knows everything in unix.
I have an AIX and wanted to secure the remote terminal, I mean i dont want the windows OS terminal directly connect the unix box using telnet.
How and what files should I reconfigure in order not to connect using the terminal
You can configure /etc/hosts.allow and /etc/hosts.deny accordingly, they control accesses of standard services or u may use a 'tcp wrapper' too. You might also consider using secure shell (ssh) for remote connection ...
i'd pretty much say the same. disable all unsecure services in /etc/inetd.conf (and be sure to run the 'refresh -s inetd' after you change it). install ssh.