Comment 6 for bug 1180281

This also affects 13.04, and it isn't limited to virt-manager.

$ virsh -V && virsh -c xen:/// version
Virsh command line tool of libvirt 1.0.2
See website at http://libvirt.org/

Compiled with support for:
 Hypervisors: QEMU/KVM LXC UML Xen OpenVZ VMWare VirtualBox Test
 Networking: Remote Network Bridging Interface netcf Nwfilter VirtualPort
 Storage: Dir Disk Filesystem SCSI Multipath iSCSI LVM RBD Sheepdog
 Miscellaneous: Daemon Nodedev AppArmor Secrets Debug Readline Modular
error: failed to connect to the hypervisor
error: unable to connect to 'localhost:8000': Connection refused