http://fedoranews.org/tchung/vnc/index.shtml


1. Do you have it in my system ?

Type following command to check if you have the client and server installed in
 your system.

[tchung@tchung101 tchung]$ rpm -q vnc vnc-server
vnc-4.0-0.beta4.3.2
vnc-server-4.0-0.beta4.3.2
[tchung@tchung101 tchung]$


2.
To configure vncserver as a service on your system, add yourself in following
config file.

[tchung@tchung101 tchung]$ sudo vi /etc/sysconfig/vncservers

# The VNCSERVERS variable is a list of display:user pairs.
#
# Uncomment the line below to start a VNC server on display :1
# as my 'myusername' (adjust this to your own).  You will also
# need to set a VNC password; run 'man vncpasswd' to see how
# to do that.
#
# DO NOT RUN THIS SERVICE if your local area network is
# untrusted!  For a secure way of using VNC, see
# URL:http://www.uk.research.att.com/vnc/sshvnc.html


# VNCSERVERS="1:myusername"
VNCSERVERS="1:tchung"


3.
Before starting vncserver as a service, let's create a vnc password with vncpa
sswd command.
Notice it creates a hidden directory .vnc under your home account with file pa
sswd which contains your vnc password.

[tchung@tchung101 tchung]$ vncpasswd
Password:
Verify:
[tchung@tchung101 tchung]$ ls -d .vnc
.vnc
[tchung@tchung101 tchung]$ ls .vnc
passwd
[tchung@tchung101 tchung]$


4.
Now let's start vncserver as a service.

[tchung@tchung101 tchung]$ sudo /sbin/service vncserver start
Starting VNC server: 1:tchung                              [  OK  ]
[tchung@tchung101 tchung]$
Take a look at the contents of .vnc directory now. You should have something s
imiliar to following.

[tchung@tchung101 tchung]$ cd .vnc
[tchung@tchung101 .vnc]$ ls
passwd  tchung101:1.log  tchung101:1.pid  xstartup
[tchung@tchung101 .vnc]$
If you edit the script called xstartup, you will notice following comment in r
ed.
Uncomment those two lines in red as shown below!!! Otherwise, you will get not
hing but grey screen.
#!/bin/sh


# Uncomment the following two lines for normal desktop:

unset SESSION_MANAGER
exec /etc/X11/xinit/xinitrc



[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
twm &


5.
Since we've just edited vnc startup script, let's restart the vncserver.

[tchung@tchung101 tchung]$ sudo /sbin/service vncserver restart
Shutting down VNC server: 1:tchung                         [  OK  ]
Starting VNC server: 1:tchung                              [  OK  ]
[tchung@tchung101 tchung]$
So how do I connect to vncserver? Use vncviewer command in vnc client as follo
wing.
[tchung@tchung101 tchung]$ vncviewer localhost:1

UPDATE:
To connect to a remote system with firewall, port 5901 needs to be open.
Add following line in red to open port 5901 and restart iptables service.

[tchung@tchung101 tchung]$ sudo vi /etc/sysconfig/iptables

# Firewall configuration written by redhat-config-securitylevel
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p 50 -j ACCEPT
-A RH-Firewall-1-INPUT -p 51 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 5901 -j ACCE
PT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
COMMIT

[tchung@tchung101 tchung]$ sudo /sbin/service iptables restart
Flushing firewall rules:                                   [  OK  ]
Setting chains to policy ACCEPT: filter                    [  OK  ]
Unloading iptables modules:                                [  OK  ]
Applying iptables firewall rules:                          [  OK  ]
[tchung@tchung101 tchung]$


To enable two different users in vncservers:


    VNCSERVERS="1:tchung 2:thomasc"
You will, of course have to run vncpasswd for both users. Also in your firewal
l update, you may want to clarify that VNC uses port 5901 for connection 1. If
 you had both users above, you would have to have ports 5901 and 5902 open.