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Launch image - horizon. ConnectionFailed: Connection to neutron failed: Maximum attempts reached

Hi,

When I do a "launch" on an Image in Horizon I got error.
"Error: The server has either erred or is incapable of performing the requested operation. (HTTP 500) (Request-ID: req-d358c8a5-4aff-4525-9c30-58155f5ee447)"

cat /var/log/nova/nova-api.log

2015-03-27 16:28:34.716 23724 TRACE nova.api.openstack Traceback (most recent call last):
2015-03-27 16:28:34.716 23724 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/__init__.py", line 125, in __call__
2015-03-27 16:28:34.716 23724 TRACE nova.api.openstack     return req.get_response(self.application)
2015-03-27 16:28:34.716 23724 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1320, in send
2015-03-27 16:28:34.716 23724 TRACE nova.api.openstack     application, catch_exc_info=False)
2015-03-27 16:28:34.716 23724 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1284, in call_application
   ......**some deleted items from the log**.....
    2015-03-27 16:28:34.716 23724 TRACE nova.api.openstack     headers=headers, params=params)
    2015-03-27 16:28:34.716 23724 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1228, in retry_request
    2015-03-27 16:28:34.716 23724 TRACE nova.api.openstack     raise exceptions.ConnectionFailed(reason=_("Maximum attempts reached"))
    2015-03-27 16:28:34.716 23724 TRACE nova.api.openstack ConnectionFailed: Connection to neutron failed: Maximum attempts reached

Im out for options. Many thanks for answers.