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In previous Fedora/CentOS distributions I was always able to run "gnome-session" over SSH with X11 forwarding. However, in Fedora 20, I instead get a window with a sad-face graphic that says "Oh no! Something has gone wrong. A problem has occurred and the system can't recover. Please log out and try again." In the SSH command window I get this:

[root@localhost ~]# gnome-session

** (gnome-session-check-accelerated:20362): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-ygVJHDDRF1: Connection refused
gnome-session-is-accelerated: No hardware 3D support.
gnome-session-check-accelerated: Helper exited with code 256

** (gnome-session-check-accelerated:20372): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-ygVJHDDRF1: Connection refused
gnome-session-is-accelerated: No hardware 3D support.
gnome-session-check-accelerated: Helper exited with code 256

** (process:20356): WARNING **: software acceleration check failed: Child process exited with code 1

I am able to run most applications over X11. I tried setenforce 0 and systemctl stop firewalld but the problem still occurs. The end of the "dmesg" output doesn't appear to be useful. Why would gnome-session fail to run on X11? Is this related to my other issue with firewall-config? Fedora 20 FirewallD GUI not working on X11 forwarding

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You need to change your window manager to something that doesn't use 3D acceleration. Set your Gnome session to fallback mode and it should work fine.

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  • Can you please elaborate; how do I make this setting? Is it a function of the server I'm connecting to or of my SSH client? I'm connecting from Cygwin using XTerm, with the "ssh -X" / "ssh -Y" commands.
    – user553702
    Jan 12, 2014 at 9:17

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