could somebody tell me whether I need(..)
Temporarily disable the services and find out. "netstat -anp" gives you the Process ID (PID), trace that to the binary that's run, and scan /etc/rc.d/init.d and /etc/xinetd.d for the initscripts. In init.d use "stop" argument when calling script, in xinetd.d add "disable" to the service arguments and restart xinetd ("man xinetd.conf" for more).
* Check out the LQ FAQ: Security references
, start at post #1 under "Checklists".