Ever since I upgraded my laptop from FC15 to FC17, I've been getting this message when I ssh to some RHEL6 hosts inside Red Hat. In particular, I'm trying to do this: virt-viewer --connect \ qemu+ssh://kvm11.devlab.phx1.redhat.com/system \ bork-s01.candlepin.dev.devlab.phx1.redhat.com This is the message I get: X11 forwarding request failed on channel 0 A viewer window pops up for a fraction of a second and then goes away. Using -vvvv on the local ssh command gives a few possibly related messages: debug2: x11_get_proto: /usr/bin/xauth list :0.0 2>/dev/null debug1: Requesting X11 forwarding with authentication spoofing. debug2: channel 0: request x11-req confirm 1 debug1: Requesting authentication agent forwarding. debug2: channel 0: request auth-agent-req(a)openssh.com confirm 0 : debug1: Remote: No xauth program; cannot forward with spoofing. This is new, and, not being an X maven, largely opaque to me. xauth is provided by package xorg-x11-xauth, which is typically *not* installed. Installing it on the system to which I'm trying to ssh gets rid of the message, but doesn't change the up-down behaviour of the viewer window. Temporarily moving my local /usr/bin/xauth leads to this message in addition: Warning: No xauth data; using fake authentication data for X11 forwarding. X11 forwarding request failed on channel 0 Since there's a window popping up at all, I doubt this is directly related to the problem getting the viewer to run. However, on systems *with* xauth installed 'echo $DISPLAY' shows a value, but on those *without* xauth, $DISPLAY is null. (So why am I getting any sort of X popup at all in that case?) Has anyone else seen this, and hopefully have a solution? The problem is actually two-fold: 1. Why 'X11 forwarding failed' and how to get rid of it/revert to behaviour in previous versions; and 2. Why is virt-viewer dying and how to keep it alive. (Again, how to revert to 'it *used* to work' conditions. ;-) ) Thanks! -- #ken B-)} Ken Coar, RHCE, RHCSA, Sanagendamgagwedweinini IT Engineering Tower, Red Hat/RDU "Millennium hand and shrimp!"