libvirt users - Jul 2010 - non-root user "virConnectOpen() faile" in libvirt-0.3

*Hello,*
*
*
*My environment is "Xen3.1 in Fedora8" with "libvirt0.3 &
python2.5". When I
ran the following *
*commands as a non-root user "nimbus":*

$python
>>> import libvirt
>>> libvirt.open("xen:///")
--------- Console ---------
[nimbus at localhost-120 ~]$ python
Python 2.5.1 (r251:54863, Oct 30 2007, 13:54:11)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-33)] on linux2
Type "help", "copyright", "credits" or
"license" for more information.
>>> import libvirt
>>> libvirt.open("xen:///")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/site-packages/libvirt.py", line 123, in
open
    if ret is None:raise libvirtError('virConnectOpen() failed')
libvirt.libvirtError: virConnectOpen() failed
>>>
*I encountered the error "virConnectOpen() failed". if I changed the
user
into root, it worked well. *
*But I hava to use the non-root account "nimbus". I looked into the
problem
on the net, in order *
*that non-root user could use libvirt as root user, someone suggested that I
should modify the libvirt *
*configuration file "/etc/libvirt/libvirtd.conf", but they didn't
point out
what field should be changed.*
*
*
*I am puzzled about that problem. I have already changed the sudo file and
the xen configuration *
*file "/etc/xen/xend-config.sxp", which doesn't work at all. Could
someome
give me any tips? *

--------- "/etc/xen/xend-config.sxp" ---------
(xend-http-server yes)
(xend-unix-server yes)
(network-script network-bridge)
*
*
*Thanks in advance!*
*
*
*Cheers,*
*
*
*Shenglan Wang*
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