Can not connect to Vncserver on Fedora 7 from Windows

On Fedora Server check whether vnc-server has been installed or not, using the command: rpm -qagrep "vnc"
If not, install it. Installation command "yum install vnc-server".
Not start vncserver. Command: vncserver
Try to connect from windows. Command: vncviewer IP_ADDRESS:1
If fails, check your Firewall settings. The port 5901 must be unblocked.
Configure Firewall using iptables to unblock the port 5901.
This will solve the problem.