How to open GUI applications on remote machine logged in via SSH on OS X I am logging into a remote Fedora 12 machine via SSH. I have enabled X11 forwarding by passing -X parameter to ssh. I also tried trusted forwarding with -Y. Both of them fail with (gedit:3711): Gtk-WARNING **: cannot open display, when I try opening a file with gedit on the remote machine.

What am I missing?
Try running a local X11 application first. If that doesn't work, reinstall Xquartz and log out and back in again.