Debian – Can’t connect to remote Xen libvirt with ssh, using virsh or virt-manager

I'm running Xen 4 on a Debian server running Squeeze (stable). I want to connect remotely over ssh using virt-manager or virsh, because I can do that on a Lenny server (oldstable).

Xen is installed correctly, booted, I can do # xm list and see which domU are booted.
Libvirt-bin is installed, and running, with /etc/libvirt/libvirtd.conf changed as following

listen_tls = 0
listen_tcp = 1
tcp_port = "8000"
listen_addr = "127.0.0.1"

netstat -tpln confirms that libvirtd listens to 127.0.0.1:8000

If i try to connect with virt-manager or virsh I don't have any error, just the connection hangs and never terminates…

Do you have any idea what can be the problem? I have tried on 2 different squeeze servers and never get it working.

thanks.