[libvirt-users] virt-manager/libvirt backwards compatibility problem?

Hi, Wanting to test some recent features of libvirt, I installed 0.9.3 on a couple of systems. It works fine on those, but since upgrading neither of them can successfully connect with virt-manager or virsh to a couple of other systems running libvirt 0.8.3. Even after upgrading virt-manager and virtinst to the latest versions on the 0.9.3 systems, they fail like this in virt-manager: Unable to open a connection to the libvirt management daemon. Libvirt URI is: qemu+ssh://root@192.168.1.67/system Verify that: - The 'libvirtd' daemon has been started Cannot recv data: : Connection reset by peer Traceback (most recent call last): File "/usr/src/virt-manager-0.8.7/src/virtManager/connection.py", line 1055, in _try_open None], flags) File "/usr/local/lib/python2.7/dist-packages/libvirt.py", line 102, in openAuth if ret is None:raise libvirtError('virConnectOpenAuth() failed') libvirtError: Cannot recv data: : Connection reset by peer Virsh simple fails with: error: Cannot recv data: : Connection reset by peer error: failed to connect to the hypervisor Since it's certain that the libvirtd daemon has been started on the other systems (they have production VMs that are running), this leaves me puzzled. This connection for virt-manager worked flawlessly for months when all the systems had libvirt 0.8.3. Is this a known incompatibility? Something I have to tweak somewhere? Thanks, Whit