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My roommate and I just set up a fedora install on a computer and trying to set it up with some server application as well. However, we can't get X11 to forward, with a number of random errors:

$ fluxbox
Failed to read: session.ignoreBorder
Setting default value
Failed to read: session.forcePseudoTransparency
Setting default value

and a bunch of other hoop-la like that, followed by:

BScreen::BScreen: an error occured while querying the X server.
    another window manager already running on displaylocalhost:10.0
Error: Couldn't find screens to manage.
Make sure you don't have another window manager running.

Or if we try to start a gnome-session:

$ gnome-session
gnome-session-is-accelerated: No composite extension.
gnome-session-check-accelerated: Helper exited with code 256
gnome-session-is-accelerated: No composite extension.
gnome-session-check-accelerated: Helper exited with code 256

** (process:3643): WARNING **: software acceleration check failed: Child process exited with code 1

And a window pops up in Xquartz (I have a mac) that says:

Oh no! Something has gone wrong. A problem has occurred and the system can't recover.

And it tries me to log out, which does nothing.

Any ideas?

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Make sure you have xquarts installed and then export your DISPLAY environment variable on your Mac.

env | grep DISPLAY
DISPLAY=/tmp/launch-51CsPO/org.macosforge.xquartz:0

SSH won't work in new version of OS X 10.8.4

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I get the following error: BScreen::BScreen: an error occured while querying the X server. another window manager already running on displaylocalhost:11.0 Error: Couldn't find screens to manage. Make sure you don't have another window manager running. – mttalxndrgrrtt Sep 2 '13 at 20:50
    
@mttalxndrgrrtt That can happen if you ssh in then run startx. forums.justlinux.com/… Add the exact commands you are running to the question. You should be doing something like: ssh -vvvX foo && xeyes – spuder Sep 2 '13 at 21:30

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