NX on a centos server and connect a windows 7

I have a centOS 6.5 server cat /etc/*elease CentOS release 6.5 (Final) I tried to install the NX on it using this document https://wiki.centos.org/HowTos/FreeNX This is how I install it because the latest package was moved from the web wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm rpm -ivh epel-release-6-8.noarch.rpm wget http://li.nux.ro/download/nux/dextop/el6/x86_64/nux-dextop-release-0-2.el6.nux.noarch.rpm rpm -ivh nux-dextop-release-0-2.el6.nux.noarch.rpm yum install freenx-server nxagent yum install opennx Loaded plugins: downloadonly, fastestmirror, refresh-packagekit, security Loading mirror speeds from cached hostfile * base: centos.aol.com * extras: chicago.gaminghost.co * nux-dextop: li.nux.ro * updates: centos.pymesolutionsweb.com Setting up Install Process Package opennx-0.16-724.el6.centos.1.x86_64 already installed and latest version Nothing to do Then I install it on a Desktop environment (windows 7) on the machine in order to run the remote session. I installed the opnenx using the following link http://opennx.net/ I set it up as it is explained here https://wiki.centos.org/HowTos/FreeNX Then I try to connect but it always gives me the following message what should I do?