Hi all, My laptop is MAC OS 10.8 and I have installed XQuartz. It works well when I display something in the terminal. But when I ssh to linux server (i.e., ssh -Y or ssh -X ), and execute "xclock" or "gv" commands, the X window can not be displayed. The information shows that : [user at node00~] connect /tmp/.X11-unix/X0: No such file or directory [user at node00~] X connection to localhost:11.0 broken (explicit kill or server shutdown). I have modified the .ssh/config file to set "ForwardAgent yes" and "ForwardX11 yes". echo $DISPLAY on my laptop shows: US at Here_$ echo $DISPLAY :0.0 and echo $DISPLAY on remote linux server shows: [user at node00 ~]$ echo $DISPLAY localhost:11.0 How can I fix this problem? Best XH