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Horizon: 500 internal error

Hello,

I've installed openstack on two nodes - Ubuntu 16.04 - newton. Install steps: http://docs.openstack.org/newton/install-guide-ubuntu/ All looks fine, but I have a problem with Dashboard. I'm getting 500 Internal server error.

A few last lines from /var/log/apache2/error.log:

    [Fri Dec 09 17:53:51.125732 2016] [core:notice] [pid 21858:tid 140153683265408] AH00051: child pid 23453 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Fri Dec 09 17:53:51.125736 2016] [core:error] [pid 21858:tid 140153683265408] AH00546: no record of generation 0 of exiting child 23453
[Fri Dec 09 17:53:52.125878 2016] [core:notice] [pid 21858:tid 140153683265408] AH00051: child pid 23532 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Fri Dec 09 17:53:52.125912 2016] [core:error] [pid 21858:tid 140153683265408] AH00546: no record of generation 0 of exiting child 23532
[Fri Dec 09 17:53:52.125922 2016] [core:notice] [pid 21858:tid 140153683265408] AH00051: child pid 23533 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Fri Dec 09 17:53:52.125925 2016] [core:error] [pid 21858:tid 140153683265408] AH00546: no record of generation 0 of exiting child 23533
[Fri Dec 09 17:57:53.826689 2016] [mpm_event:notice] [pid 21858:tid 140153683265408] AH00491: caught SIGTERM, shutting down
[Fri Dec 09 17:57:54.925374 2016] [wsgi:warn] [pid 23846:tid 140526517929856] mod_wsgi: Compiled for Python/2.7.11.
[Fri Dec 09 17:57:54.925416 2016] [wsgi:warn] [pid 23846:tid 140526517929856] mod_wsgi: Runtime using Python/2.7.12.
[Fri Dec 09 17:57:54.927308 2016] [mpm_event:notice] [pid 23846:tid 140526517929856] AH00489: Apache/2.4.18 (Ubuntu) mod_wsgi/4.3.0 Python/2.7.12 configured -- resuming normal operations
[Fri Dec 09 17:57:54.927374 2016] [core:notice] [pid 23846:tid 140526517929856] AH00094: Command line: '/usr/sbin/apache2'
[Fri Dec 09 18:03:07.152782 2016] [mpm_event:notice] [pid 23846:tid 140526517929856] AH00493: SIGUSR1 received.  Doing graceful restart
[Fri Dec 09 18:03:07.625195 2016] [wsgi:warn] [pid 23846:tid 140526517929856] mod_wsgi: Compiled for Python/2.7.11.
[Fri Dec 09 18:03:07.625227 2016] [wsgi:warn] [pid 23846:tid 140526517929856] mod_wsgi: Runtime using Python/2.7.12.
[Fri Dec 09 18:03:07.632897 2016] [mpm_event:notice] [pid 23846:tid 140526517929856] AH00489: Apache/2.4.18 (Ubuntu) mod_wsgi/4.3.0 Python/2.7.12 configured -- resuming normal operations
[Fri Dec 09 18:03:07.632956 2016] [core:notice] [pid 23846:tid 140526517929856] AH00094: Command line: '/usr/sbin/apache2'
[Fri Dec 09 18:12:30.321293 2016] [mpm_event:notice] [pid 23846:tid 140526517929856] AH00493: SIGUSR1 received.  Doing graceful restart
[Fri Dec 09 18:12:30.371626 2016] [wsgi:warn] [pid 23846:tid 140526517929856] mod_wsgi: Compiled for Python/2.7.11.
[Fri Dec 09 18:12:30.371638 2016] [wsgi:warn] [pid 23846:tid 140526517929856] mod_wsgi: Runtime using Python/2.7.12.
[Fri Dec 09 18:12:30.373545 2016] [mpm_event:notice] [pid 23846:tid 140526517929856] AH00489: Apache/2.4.18 (Ubuntu) mod_wsgi/4.3.0 Python/2.7.12 configured -- resuming normal operations
[Fri Dec 09 18:12:30.373560 2016] [core:notice] [pid 23846:tid 140526517929856] AH00094: Command line: '/usr/sbin/apache2'
[Fri Dec 09 18:17:40.334421 2016] [wsgi:error] [pid 25384:tid 140526405338880] [client 10.0.100.11:37452] Timeout when reading response headers from daemon process 'horizon': /usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi
[Fri Dec 09 18:18:54.771118 2016] [mpm_event:notice] [pid 23846:tid 140526517929856] AH00491: caught SIGTERM, shutting down
[Fri Dec 09 18:20:11.265900 2016] [wsgi:warn] [pid 1693:tid 139903398381440] mod_wsgi: Compiled for Python/2.7.11.
[Fri Dec 09 18:20:11.278608 2016] [wsgi:warn] [pid 1693:tid 139903398381440] mod_wsgi: Runtime using Python/2.7.12.
[Fri Dec 09 18:20:11.280794 2016] [mpm_event:notice] [pid 1693:tid 139903398381440] AH00489: Apache/2.4.18 (Ubuntu) mod_wsgi/4.3.0 Python/2.7.12 configured -- resuming normal operations
[Fri Dec 09 18:20:11.280854 2016] [core:notice] [pid 1693:tid 139903398381440] AH00094: Command line: '/usr/sbin/apache2'
[Fri Dec 09 18:28:17.452141 2016] [wsgi:error] [pid 1710:tid 139903115421440] [client 10.0.100.2:52142] Timeout when reading response headers from daemon process 'horizon': /usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi
[Fri Dec 09 18:28:24.668266 2016] [wsgi:error] [pid 1710:tid 139903098636032] [client 10.0.100.2:52561] Truncated or oversized response headers received from daemon process 'horizon': /usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi
[Fri Dec 09 18:28:47.450987 2016] [wsgi:error] [pid 1710:tid 139903107028736] [client 192.168.0.18:52193] Timeout when reading response headers from daemon process 'horizon': /usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi
[Fri Dec 09 18:28:52.688274 2016] [wsgi:error] [pid 1709:tid 139903294183168] [client 192.168.0.18:52481] Truncated or oversized response headers received from daemon process 'horizon': /usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi
[Fri Dec 09 18:31:11.998655 2016] [wsgi:error] [pid 1709:tid 139903107028736] [client 10.0.100.2:52432] Timeout when reading response headers from daemon process 'horizon': /usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi
[Fri Dec 09 18:31:17.804970 2016] [wsgi:error] [pid 1709:tid 139903098636032] [client 10.0.100.2:52715] Truncated or oversized response headers received from daemon process 'horizon': /usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi