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Horizon cannot connet to Keystone

Hello everyone,

Last day, i installed OpenStack thanks to Devstack on Ubuntu 16.04 and Horizon worked, i could log as admin. However, today, when i started horizon, i could not connect, and I have this answer from horizon : "An error occurred authenticating. Please try again later.".

I can read on file /var/log/apache2/horizon_error.log :

2017-05-05 15:40:03.429306 failed to make connection to backend: httpd-UDS:0

2017-05-05 15:40:03.432566 AH02454: uwsgi: attempt to connect to Unix domain socket /var/run/uwsgi/keystone-wsgi-public.socket (uwsgi-uds-keystone-wsgi-public) failed

2017-05-05 15:40:03.432579 AH00959: ap_proxy_connect_backend disabling worker for (uwsgi-uds-keystone-wsgi-public) for 0s

It seems that horizon cannot connect to Keystone.

Could you help me please ?