First thinks for your replay. these are the steps I took:
- logged in as Root then tuped in VNCSERVER, set password. created 2 users set there VNCSERVER Dispaly for diffrent settings:
- Edited IPTABLES to add port 5901- 5909 restarted IPTABLE services
-Edited xstartup file under .VNC directory ( uncommented the first 2 line

- I have fedora 8 installed in diffrent machine and VNC works fine.
if you need more details please let me know.
thanks again,
Aziz