centos6.5 kvm virt-manager

Question

/usr/bin/python2.6.6 "/usr/share/virt-manager/virt-manager.py"

Error starting Virtual Machine Manager: Failed to contact configuration server; some possible causes are that you need to enable TCP/IP networking for ORBit, or you have stale NFS locks due to a system crash. See http://projects.gnome.org/gconf/ for information. (Details - 1: Failed to get connection to session: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.)

Traceback (most recent call last):
File "/usr/share/virt-manager/virt-manager.py", line 400, in
main()
File "/usr/share/virt-manager/virt-manager.py", line 329, in main
config = virtManager.config.vmmConfig(appname, appversion, glade_dir)
File "/usr/share/virt-manager/virtManager/config.py", line 98, in init
self.conf.add_dir(self.conf_dir, gconf.CLIENT_PRELOAD_NONE)
GError: Failed to contact configuration server; some possible causes are that you need to enable TCP/IP networking for ORBit, or you have stale NFS locks due to a system crash. See http://projects.gnome.org/gconf/ for information. (Details - 1: Failed to get connection to session: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.)

log information
23821: error : virCommandWait:2319 : internal error Child process (/sbin/iptables --table filter --delete INPUT --in-interface virbr0 --protocol tcp --destination-port 67 --jump ACCEPT) unexpected exit status 1: iptables: Bad rule (does a matching rule exist in that chain?).