Configurar VNC en RHEL 6 sin vino

Primero hay que instalar el servidor vncserver

yum install vnc-server

o descargar el rpm

wget ftp://ftp.sunet.se/pub/Linux/distributions/scientific/53/x86_64/SL/vnc-server-4.1.2-14.el5_3.1.x86_64.rpm

instalar el rpm
 rpm -ivh vnc-server-4.1.2-14.el5_3.1.x86_64.rpm

configurar el servicio encendido en el arranque

chkconfig vnc-server on

Editar /root/.vnc/xstartup y poner lo siguiente

#!/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 &
if test -z "$DBUS_SESSION_BUS_ADDRESS" ; then
    eval `dbus-launch --sh-syntax –exit-with-session`
    echo "D-BUS per-session daemon address is: \
    $DBUS_SESSION_BUS_ADDRESS"
fi
exec  gnome-session

En el archivo /etc/sysconfig/vncservers ponemos

# The VNCSERVERS variable is a list of display:user pairs.
#
# Uncomment the lines below to start a VNC server on display :2
# 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/archive/vnc/sshvnc.html>.

# Use "-nolisten tcp" to prevent X connections to your VNC server via TCP.

# Use "-nohttpd" to prevent web-based VNC clients connecting.

# Use "-localhost" to prevent remote VNC clients connecting except when
# doing so through a secure tunnel.  See the "-via" option in the
# `man vncviewer' manual page.

# VNCSERVERS="2:myusername"
# VNCSERVERARGS[2]="-geometry 800x600 -nolisten tcp -nohttpd -localhost"

VNCSERVERS="1:root"
VNCSERVERARGS[1]="-geometry 1024x768 -nolisten tcp -nohttpd"

y reiniciamos

service vncserver restart