VNC is platform-independent – a VNC viewer on one operating system may connect to a VNC server on the same or any other operating system. There are clients and servers for many GUI-based operating systems and for Java. Multiple clients may connect to a VNC server at the same time. Popular uses for this technology include remote technical support and accessing files on one's work computer from one's home computer, or vice versa.
Below are the steps to configure the VNC server in Redhat Enterprise Linux
1) Install vnc packages
a) vnc-server
b) vnc
2) vi /etc/sysconfig/vncservers
add the new user
VNCSERVERS="1:sri" -----> here 1 is your port number i.e 5901
VNCSERVERARGS[1]="-geometry 1024x768 -depth 16"
3) set the password
---- type the command vncpasswd enter the password
4) If you want normal desktop then edit the file
vi ~/.vnc/startup
-----> uncomment first two lines for noraml desktop
5) Start the vnc server
vncserver :1
6) For stopping you can /sbin/service vncserver stop (or) vncserver -kill :1
7) To connect from your own computer use the vncviewer command
vncviewer localhost:5901
8) For remote connections
i) Change and allow the users to connect to the server
Preferences--> Remote desktop preferences
ii) open system--->Administration---> security level and firewal in other ports section add the port number
iii) Add the following line in /etc/sysconfig/iptables before the last line
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 5901
iV) service iptables save
v) service iptables restart
9) start the vnc server from remote location
10) ip:port number (192.168.64.128:5901)
Enjoy Vncing....
