When I login horizon,it occurs connection errors. How can deal with it?

These are error information:

ConnectionError at /project/
[Errno 111] Connection refused
Request Method: GET
Request URL:    http://10.46.178.24/dashboard/project/
Django Version: 1.4.6
Exception Type: ConnectionError
Exception Value:    
[Errno 111] Connection refused
Exception Location: /usr/lib/python2.6/site-packages/requests/adapters.py in send, line 206
Python Executable:  /usr/bin/python
Python Version: 2.6.6
Python Path:    
['/usr/share/openstack-dashboard/openstack_dashboard/wsgi/../..',
 '/usr/lib/python2.6/site-packages/pip-1.4.1-py2.6.egg',
 '/usr/lib/python2.6/site-packages/setuptools-1.1.6-py2.6.egg',
 '/usr/lib64/python26.zip',
 '/usr/lib64/python2.6',
 '/usr/lib64/python2.6/plat-linux2',
 '/usr/lib64/python2.6/lib-tk',
 '/usr/lib64/python2.6/lib-old',
 '/usr/lib64/python2.6/lib-dynload',
 '/usr/lib64/python2.6/site-packages',
 '/usr/lib64/python2.6/site-packages/gst-0.10',
 '/usr/lib64/python2.6/site-packages/gtk-2.0',
 '/usr/lib64/python2.6/site-packages/webkit-1.0',
 '/usr/lib/python2.6/site-packages',
 '/usr/share/openstack-dashboard/openstack_dashboard'