There is log:

2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi [req-0c28644a-799b-41ea-af15-fd9039557ce9 - - - - -] too many values to unpack
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi Traceback (most recent call last):
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/keystone/common/wsgi.py", line 249, in __call__
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     result = method(context, **params)
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/oslo_log/versionutils.py", line 165, in wrapped
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     return func_or_cls(*args, **kwargs)
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/keystone/token/controllers.py", line 100, in authenticate
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     context, auth)

2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/keystone/token/controllers.py", line 309, in _authenticate_local                    [332/9850]
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     user_id, tenant_id)
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/keystone/token/controllers.py", line 390, in _get_project_roles_and_ref
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     user_id, tenant_id)
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/keystone/common/manager.py", line 124, in wrapped
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     __ret_val = __f(*args, **kwargs)
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/dogpile/cache/region.py", line 1053, in decorate
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     should_cache_fn)
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/dogpile/cache/region.py", line 657, in get_or_create
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     async_creator) as value:
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/dogpile/core/dogpile.py", line 158, in __enter__
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     return self._enter()
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/dogpile/core/dogpile.py", line 91, in _enter
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     value = value_fn()
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/dogpile/cache/region.py", line 610, in get_value
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     value = self.backend.get(key)
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/keystone/common/cache/_context_cache.py", line 96, in get
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     value = self.proxied.get(key)
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/dogpile/cache/backends/memcached.py", line 161, in get
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     value = self.client.get(key)
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/oslo_cache/backends/memcache_pool.py", line 36, in _run_method
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     return getattr(client, __name)(*args, **kwargs)
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/memcache.py", line 1093, in get
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     return self._get('get', key)
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/memcache.py", line 1077, in _get
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     return _unsafe_get()
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/memcache.py", line 1059, in _unsafe_get
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     server, raise_exception=True
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi   File "/usr/lib/python2.7/dist-packages/memcache.py", line 1211, in _expectvalue
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi     resp, rkey, flags, len = line.split()
2016-08-03 12:43:31.578 341 ERROR keystone.common.wsgi ValueError: too many values to unpack