Restarted libvirt to listen at tcp
$ sudo /etc/init.d/libvirt-bin stop
[sudo] password for fluent:
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service libvirt-bin stop

Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the stop(8) utility, e.g. stop libvirt-bin
libvirt-bin stop/waiting
$ sudo libvirtd -d --listen



Now am getting this error :

libvirt: XML-RPC error : authentication failed: Failed to start SASL negotiation: -4 (SASL(-4): no mechanism available: No worthy mechs found)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/fluent/cvt/convirt-enterprise/tg2env/local/lib/python2.7/site-packages/libvirt.py", line 239, in open
    if ret is None:raise libvirtError('virConnectOpen() failed')
libvirt.libvirtError: authentication failed: Failed to start SASL negotiation: -4 (SASL(-4): no mechanism available: No worthy mechs found)