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Unable to log into Horizon in Ocata. Previous solution doesn't work

I'm experiencing the problem where I attempt to log into the OpenStack Dashboard but it simply redirects me back to the login page. Apache's error.log file indicates a successful login attempt was made. I know this issue has been seen before and a solution was found in this thread:

However, I have copy and pasted the solution in my /etc/openstack-dashboard/ configuration file and restarted all my services, but it has not made any difference:


    'default': {
        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
        'LOCATION': '',

I have memcache listening on localhost on that port:

root@bllcloudctl01:~# ss -tupan | grep 11211
udp    UNCONN     0      0                 *:*                  
tcp    LISTEN     0      128                 *:*

I'm on Ubuntu 16.04 following the OpenStack Ocata documentation. These are the relevant log files I have been looking at:


[Fri Jul 07 15:06:49.374597 2017] [wsgi:error] [pid 3689:tid 139784728393472] Attempted scope to domain Default failed, will attemptto scope to another domain.
[Fri Jul 07 15:06:49.622761 2017] [wsgi:error] [pid 3689:tid 139784728393472] Login successful for user "demo", remote address 2603:3026:30d:5600:ed3b:6fcc:280e:6daf.


2017-07-07 15:07:46.832441 2017-07-07 15:07:46.831 3696 INFO keystone.common.wsgi [req-0486459b-c63c-43e7-84de-8c8c51d253e2 - - - - -] POST http://bllcloudctl01:5000/v3/auth/tokens
2017-07-07 15:07:47.082657 2017-07-07 15:07:47.082 3695 INFO keystone.common.wsgi [req-5ed1da5b-531f-4173-988c-46d1a3b4370f d2072b0351954cfc9f2960df1a20c93d - - default -] POST http://bllcloudctl01:5000/v3/auth/tokens
2017-07-07 15:07:47.138713 2017-07-07 15:07:47.138 3695 WARNING keystone.common.wsgi [req-5ed1da5b-531f-4173-988c-46d1a3b4370f d2072b0351954cfc9f2960df1a20c93d - - default -] Authorization failed. The request you have made requires authentication. from 2620:5:e000:201f::2:a
2017-07-07 15:07:47.152907 2017-07-07 15:07:47.152 3692 INFO keystone.common.wsgi [req-c928fdf1-b6a5-4345-aa6e-2a70ca40d4dd - - - - -] GET http://bllcloudctl01:5000/v3/
2017-07-07 15:07:47.170355 2017-07-07 15:07:47.169 3694 INFO keystone.common.wsgi [req-c3dedfba-ed0c-46e8-93d0-a294b0c0ed18 d2072b0351954cfc9f2960df1a20c93d - - default -] GET http://bllcloudctl01:5000/v3/users/d2072b0351954cfc9f2960df1a20c93d/projects
2017-07-07 15:07:47.246885 2017-07-07 15:07:47.246 3696 INFO keystone.common.wsgi [req-25c2a832-9c41-43bf-abf0-366ac6256376 d2072b0351954cfc9f2960df1a20c93d - - default -] POST http://bllcloudctl01:5000/v3/auth/tokens

It is odd to me that is always does a POST to /v3/auth/tokens which fails. When I test the authentication on the command line I see that the process is a GET to /v3 then a POST to /v3/auth/tokens. It appears that the dashboard eventually does this, but it does a POST first, fails, then does the GET, then another POST. I'm assuming this last POST succeeds as there are no additional entries past this point and I see "login successful..." message in the error.log

Is anybody else experiencing this issue on Ocata. Does anybody know of other logs I can check to further debug this issue.