vncviewer: unable to open display ""

See http://www.realvnc.com for information on VNC.

vncviewer: unable to open display "

ERROR MESSAGE
vncviewer: unable to open display

PROBLEM
while Login through ssh we Didn't enable the X11.

X11 refers to the GUI - Graphical User Interface

SOLUTION

while login though ssh use the option '-X' To enable X11.

-X enable X11

-x Disable X11.

Then it will work

[root@remote ~]# ssh -X 151.8.19.141

Last login: Tue Feb 1 10:18:55 2011 from 151.8.18.160

[root@ha1 ~]# vncserver

New 'ha1.hcl.in:4 (root)' desktop is ha1.hcl.in:4

Starting applications specified in /root/.vnc/xstartup

Log file is /root/.vnc/ha1.hcl.in:4.log

[root@ha1 ~]# vncviewer :4

VNC Viewer Free Edition 4.1.2 for X - built Jan 26 2009 11:52:08

Copyright (C) 2002-2005 RealVNC Ltd.

See http://www.realvnc.com for information on VNC.

Tue Feb 1 10:19:26 2011

CConn: connected to host localhost port 5904

CConnection: Server supports RFB protocol version 3.8

CConnection: Using RFB protocol version 3.8

Then I got the Graphical Window For the Remote System.

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