I make a connection through SSH and then I type:
# x0vncserver --PasswordFile=/home/hello/.vnc/passwd
x0vncserver: unable to open display ""
~ImageCleanup called
the reason is :
x0vncserver is an X-Windows CLIENT program. Where is the X-Windows SERVER on which the display you want to poll is presented? Presumably defined by the DISPLAY environment variable. What output do you get from the ssh shell level if you enter
#$ echo $DISPLAY [return]
I suspect it will be empty, so your X client (x0vncserver) won‘t know what to try to connect to. [Which is what it is telling you - unable to open display "" ]
Either make the ssh connection set up a tunnel for the X-windows stuff [you‘ll need a manual for your ssh client to do that], or set the DISPLAY variable to point to the server. (Only you know where it is, but the command will be something like
$ export DISPLAY=":0.0")
or run x0vncserver -h to see if there is a command line option to set the display as you start the program.I typed echo $DISPLAY on the main-console(or on your linux host ) and it echos :0.0
so i set DISPLAY environment
# export DISPLAY=":0.0"
then i retype the command
# x0vncserver --PasswordFile=/home/xiaoyang/.vnc/passwd
Tue Sep 4 13:33:29 2012
main: XTest extension present - version 2.2
main: Listening on port 5900
SO, It‘s OK !!
About x0vncserver see http://blog.csdn.net/gpstrive/article/details/24905023
x0vncserver Fatal server error: no screens found,布布扣,bubuko.com
x0vncserver Fatal server error: no screens found
原文：http://blog.csdn.net/gpstrive/article/details/25040655