[libvirt-users] "connection refused", but server is listening

netstat -lptu gives me tcp6 0 0 [::]:16514 [::]:* LISTEN 1314/libvirtd so the server is correctly listening on interfaces. My /etc/libvirt/libvirtd settings are defaulted. My /etc/default/libvirt-bin has "-d -l" options so server is listening. If I do virsh -c qemu://143.225.229.190/system (that is my ip or an ip belonging to my network) I get "connection refused". How come? And note that if I put my address, 143.225.229.190, as listening address in the libvirtd conf file, I get "this address class is not supported".