Hi Mahmood,

The most common problem I have is due to iptables blocking the vnc 
port.  The easiest way to check if that is the problem  is by trying to 
telnet to the appropriate port (ie :0 is 5900 :1 is 5901 ...)  If it 
works from localhost but not from a remote it is iptables or another 
firewall.

Joe

On 03/05/2013 07:06 AM, Mahmood Naderan wrote:
> Hi,
> I have installed vncserver on SL6.3 and followed this guide
>
> http://vjetnamnet.com/how-to-setup-vnc-server-on-centos-6-3/
>
>
> However when I try to connect from windows, I get
>
> "connection timed out" message.
>
> I searched a lot to diagnose vnc server. However I didn't
> find a step by step guide. What should I check in order to
>
> be sure that vnc server is working properly.
>
>   
> Regards,
> Mahmood
>