Can not use any remote desktop like VNC after installing Oracle Linux 6.3

Hi
I just installed OL 6.3 on a HP Proliant ML380 g7. Now I want to connect to the server using any Remote Desktop tools but I can not!
I've activated system>pref>Remote Desktop
But I can not access any of servers from:
- a Mac using, Mac server sharing screen, VNC viewer or Microsoft Remote connection which is in a same subnet
- Other Server Using KRDC, Remote Desktop Viewer, terminal server client or tiger VNC viewer
Also I tried to connect to servers after activating krfb
but it always says no rout to server/ server not found/ connection closed
and remote desktop viewer can not find any host when I try to use option "find"
Please Advise
Thank you in advance

Make sure to enable "require a password..." in the Remote Desktop Preference on the Linux system. Some clients won't work unless this is set. Unfortunately the Remote Desktop Preferences panel on the Linux side does not show you the port it is listening on, but you can get it by clicking on the IP or name that it shows as a link. The first user or vnc server is usually listening on port 5900, then 5901, and so on.
Your problem is probably the firewall on your Linux system. You can disable the firewall on the Linux system:
service iptables stop
However, probably a better idea, simply tunnel the connection through SSH as following:
On the Mac, open the Terminal application from the Applications/Utilities folder. Then type the following:
<pre>
ssh -L local_port:localhost:remote_port -N -f -l username server_address
</pre>
local_port = port on your Mac that does not conflict with any of your own screen-sharing or other services, e.g. 5555
remote_port = vnc server port on your Linux system
username = user for which you have enabled remote desktop sharing
server_address = ip address or FQDN of your Linux system.
For instance:
<pre>
ssh -L 5555:localhost:5900 -N -f -l root 10.0.1.2
</pre>
The trick is now to connect to a local port on your Mac, instead using the address of your Linux server. The communication will be encrypted using ssh going over tcp port 22, which is normally enabled in the firewall.
The Mac screen sharing application is working fine. On your Mac, select "Go>Connect to Server" from the Finder menu and type:
vnc://localhost:5555

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