[libvirt-users] authentication failed, but why?

[huancong deng]

I set the me into the group libvirt and write the config for libvirtd:
==================================================
listen_tls = 0
listen_tcp = 0
auth_tcp = "none"
mdns_adv = 0
unix_sock_group = "libvirt"
unix_sock_ro_perms = "0770"
unix_sock_rw_perms = "0770"
unix_sock_dir = "/var/run/libvirt"

log_filters = "1:libvirt 1:util 1:qemu"
log_output = "1:file:/var/log/libvirt/libvirtd.log"

max_clients = 500
min_workers = 10
max_workers = 50
max_requests = 50
max_client_requests = 8
===========================================
but I can't login the libvirt:
[xxxxxx at u70 ~]$ virsh
error : authentication failed: Authorization requires authentication but no
agent is available.

who can tell me why? thanks a lot.
:)
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