I get “Unable to connect to libvirt” when using virt-manager in combination with the XL toolstack and Xen 4.2.1. (No problems when using virt-manager in combination with the XM toolstack.) More details of the situation can be found in a bug-report that I filed on launchpad. Please see: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1180281 Judging from the information that I provided in the above referenced bug-report (some of which is copied below), does this appear to be an actual bug? Or have I failed to configure something properly? Thanks for any help with this! Best regards, GizmoChicken P.S. Here is more of the error that I get when attempting to start virt-manager: Unable to connect to libvirt. unable to connect to 'localhost:8000': Connection refused Verify that: - A Xen host kernel was booted - The Xen service has been started Libvirt URI is: xen:/// Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/connection.py", line 1027, in _open_thread self.vmm = self._try_open() File "/usr/share/virt-manager/virtManager/connection.py", line 1009, in _try_open flags) File "/usr/lib/python2.7/dist-packages/libvirt.py", line 102, in openAuth if ret is None:raise libvirtError('virConnectOpenAuth() failed') libvirtError: unable to connect to 'localhost:8000': Connection refused And here the output from var/log/libvirt/libvirtd.log 2013-05-18 05:44:47.614+0000: 1304: info : libvirt version: 1.0.5 2013-05-18 05:44:47.614+0000: 1304: error : xenHypervisorDoV2Sys:1006 : Unable to issue hypervisor ioctl 3166208: Permission denied 2013-05-18 05:44:47.615+0000: 1304: error : xenHypervisorDoV2Sys:1006 : Unable to issue hypervisor ioctl 3166208: Permission denied 2013-05-18 05:44:47.617+0000: 1304: error : xenHypervisorDoV2Sys:1006 : Unable to issue hypervisor ioctl 3166208: Permission denied 2013-05-18 05:44:47.618+0000: 1304: error : xenHypervisorDoV2Sys:1006 : Unable to issue hypervisor ioctl 3166208: Permission denied 2013-05-18 05:44:47.618+0000: 1304: error : xenHypervisorDoV2Sys:1006 : Unable to issue hypervisor ioctl 3166208: Permission denied 2013-05-18 05:44:47.619+0000: 1304: error : xenHypervisorDoV2Sys:1006 : Unable to issue hypervisor ioctl 3166208: Permission denied 2013-05-18 05:44:47.635+0000: 1304: error : do_connect:103 : internal error failed to connect to xend 2013-05-18 05:44:47.636+0000: 1304: error : xenDaemonOpen_tcp:700 : unable to connect to 'localhost:8000': Connection refused 2013-05-18 05:45:13.647+0000: 1289: error : virNetSocketReadWire:1362 : Cannot recv data: Connection reset by peer