[libvirt-users] How to use PHP libvirt_connect?

I'm having a go at writing some PHP scripts to do simple things like view the status of VMs running on my Ubuntu KVM host. I've installed php_libvirt_php but am failing at the first hurdle at the moment as I can't get the PHP script to connect. My normal way of connecting virsh from the command line is like this: $ virsh -c qemu+ssh://localhost/system This asks for a password which is fine as I'm doing it from the command line. I can't get a connection when I use other protocols: $ virsh -c qemu+tcp://192.168.0.103/system error: failed to connect to the hypervisor error: unable to connect to server at '192.168.0.103:16509': Connection refused I've tried using various $uri values for libvirt_connect but I get connection errors: $uri="qemu+tcp://localhost/system"; Connecting to libvirt (URI:qemu+tcp://localhost/system) *Warning*: libvirt_connect(): unable to connect to server at 'localhost:16509': Connection refused in */var/www/html/libvirt_test1.php* on line *8* Libvirt last error: unable to connect to server at 'localhost:16509': Connection refused $uri="qemu://localhost/system"; Connecting to libvirt (URI:qemu://localhost/system) *Warning*: libvirt_connect(): Cannot read CA certificate '/etc/pki/CA/cacert.pem': No such file or directory in */var/www/html/libvirt_test1.php* on line *8* Libvirt last error: Cannot read CA certificate '/etc/pki/CA/cacert.pem': No such file or directory $uri="qemu+tcp://localhost/system"; Connecting to libvirt (URI:qemu+tcp://localhost/system) *Warning*: libvirt_connect(): unable to connect to server at 'localhost:16509': Connection refused in */var/www/html/libvirt_test1.php* on line *8* Libvirt last error: unable to connect to server at 'localhost:16509': Connection refused Presumably the answer is to 1) either allow connections that don't require SSH, or 2) somehow allow a password-less SSH connection from the www-data user that's running the PHP script. 2) sounds like it might be very difficult, and I don't know how to do 1) as I've only ever connected this way with SSH. Can anyone please provide some advise on getting this working.