Dear [A-Za-z]+,
i ran into the same problem when trying to access my Wheezy host. I also
tried several versions from [1] not using the setup.py routine. This
problem occurred when using versions > 1.1.0.
Upgrading the host to Jessie seemed to solve the problem.
BTW: Wheezy uses libvirt 0.9.12.3-1+deb7u1 ([2]), Jessie librvirt
1.2.9-9+deb8u1 ([3]), I am using virt-manager 1.2.1-4 on Stretch.
Seems virt-manager version 1.2+ cannot access hosts running older
libvirt versions.
[1] git://git.fedorahosted.org/git/virt-manager.git
[2] https://packages.debian.org/de/source/wheezy/libvirt
[3] https://packages.debian.org/de/source/jessie/libvirt
Hope this helps,
Marco
