Hi all:
Me being new to libvirt, this may sound very trivial to you.  Any help is welcome.  I have deb7u1, with xen4.1.4 and libvirt 0.9.12 (since those are the latest available thru apt utility) .  I have enabled xen-unix-server as well as xen-http-server in the /etc/xen/xend-config.sxp file.  But I still keep getting the following message.

From local:

root@debian:~# virsh -c xen:///
error: unable to connect to 'localhost:8000': Connection refused
error: failed to connect to the hypervisor
root@debian:~#

From remote:

[root@CentOS-6 libvirt]# virsh -c xen+ssh://root@10.240.64.112/
root@10.240.64.112's password: 
error: unable to connect to 'localhost:8000': Connection refused
error: failed to connect to the hypervisor
[root@CentOS-6 libvirt]#