xvnc stopped
after few days of waiting for installers from our supplier
I finally got the chance to install customize rhel 5.11 on a workstation
but when I tried to start vnc server
it failed
VNC server: [FAILED]
but thanks to google and stackoverflow
I found the solution
removing the file X1 via
rm -f /tmp/.X11-unix/X1
and restarting VNC server worked
[root@localhost ~]# rm -f /tmp/.X11-unix/X1
and then restart vnc server
[root@localhost ~]# service vncserver start
Starting VNC server: [ OK ]
The problem is solved :)