I had a working qemu://session guest here under f17. Upgraded to f18 and it's no longer working. virt-manager says: Unable to connect to libvirt. no connection driver available for No connection for URI qemu:///session Libvirt URI is: qemu:///session 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/lib64/python2.7/site-packages/libvirt.py", line 102, in openAuth if ret is None:raise libvirtError('virConnectOpenAuth() failed') libvirtError: no connection driver available for No connection for URI qemu:///session virsh capabilities says: <capabilities> <host> <uuid>8e0fc77a-c523-ca04-9cea-a76071984a5e</uuid> <cpu> <arch>x86_64</arch> </cpu> <power_management> <suspend_mem/> <suspend_disk/> <suspend_hybrid/> </power_management> <topology> <cells num='1'> <cell id='0'> <cpus num='4'> <cpu id='0'/> <cpu id='1'/> <cpu id='2'/> <cpu id='3'/> </cpus> </cell> </cells> </topology> </host> <guest> <os_type>uml</os_type> <arch name='x86_64'> <wordsize>64</wordsize> <domain type='uml'> </domain> </arch> </guest> </capabilities> packages installed: libvirt-0.10.0-0rc0.fc18.x86_64 libvirt-client-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-config-network-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-config-nwfilter-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-driver-interface-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-driver-libxl-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-driver-lxc-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-driver-network-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-driver-nodedev-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-driver-nwfilter-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-driver-qemu-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-driver-secret-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-driver-storage-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-driver-uml-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-driver-xen-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-kvm-0.10.0-0rc0.fc18.x86_64 libvirt-daemon-qemu-0.10.0-0rc0.fc18.x86_64 libvirt-docs-0.10.0-0rc0.fc18.x86_64 libvirt-gconfig-0.1.1-1.fc18.x86_64 libvirt-glib-0.1.1-1.fc18.x86_64 libvirt-gobject-0.1.1-1.fc18.x86_64 libvirt-python-0.10.0-0rc0.fc18.x86_64 libvirt-sandbox-0.0.3-3.fc18.x86_64 libvirt-sandbox-libs-0.0.3-3.fc18.x86_64 Happy to provide more info/debugging.
Could you provide the debug log of libvirtd after it starts up?
This seems to be fixed in libvirt-0.10.0-0rc0.2.fc18