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X11 forwarding through SSH suddenly failed [closed]

As the title describes i have simply been using X11 forwarding SSH successfully for weeks, but suddenly this does no longer work: rosrun rqt_graph rqt_graph rqt_graph: cannot connect to X server ...
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X11-Forwarding ubuntu server

I'm trying to enable X11 forwarding from my headless ubuntu server (12.10) to regular ubuntu to forward virt-manager so I can install windows kvm machines. The problem is when I try to open an X ...