Openstack Dashboard unable to create a new session key

git clone https://opendev.org/openstack/devstack

[[local|localrc]]

ADMIN_PASSWORD=123
DATABASE_PASSWORD=$ADMIN_PASSWORD
RABBIT_PASSWORD=$ADMIN_PASSWORD
SERVICE_PASSWORD=$ADMIN_PASSWORD
HOST_IP=192.168.1.50
PIP_UPGRADE=True

RuntimeError at /auth/login/
Unable to create a new session key. It is likely that the cache is unavailable.
Request Method:		POST
Request URL:		http://192.168.1.50/dashboard/auth/login/
Django Version:		1.11.22
Exception Type:		RuntimeError
Exception Value:	Unable to create a new session key. It is likely that the cache is unavailable.
Exception Location:	/usr/lib/python2.7/site-packages/django/contrib/sessions/backends/cache.py in create, line 52
Python Executable:	/usr/bin/python
Python Version:		2.7.5
Python Path:		['/opt/stack/horizon',
			 '/opt/stack/keystone',
			 '/opt/stack/glance',
			 '/opt/stack/cinder',
			 '/opt/stack/neutron',
			 '/opt/stack/nova',
			 '/opt/stack/placement',
			 '/opt/stack/horizon',
			 '/opt/stack/tempest',
			 '/usr/lib64/python27.zip',
			 '/usr/lib64/python2.7',
			 '/usr/lib64/python2.7/plat-linux2',
			 '/usr/lib64/python2.7/lib-tk',
			 '/usr/lib64/python2.7/lib-old',
			 '/usr/lib64/python2.7/lib-dynload',
			 '/usr/lib64/python2.7/site-packages',
			 '/usr/lib/python2.7/site-packages',
			 '/opt/stack/horizon/openstack_dashboard']
Server time:		Mon, 29 Jul 2019 14:19:31 +0000

cat /usr/lib/python2.7/site-packages/django/contrib/sessions/backends/cache.py
def load(self):
    try:
        session_data = self._cache.get(self.cache_key)
    except Exception:
        # Some backends (e.g. memcache) raise an exception on invalid
        # cache keys. If this happens, reset the session. See #17810.
        session_data = None
    if session_data is not None:
        return session_data
    self._session_key = None
    return {}

[root@stack ~]# echo 'flush_all' | nc 127.0.0.1 11211
Ncat: Connection refused.
[root@stack ~]# nmap localhost

Starting Nmap 6.40 ( http://nmap.org ) at 2019-07-29 17:56 MSK
Nmap scan report for localhost (127.0.0.1)
Host is up (0.000010s latency).
Other addresses for localhost (not scanned): 127.0.0.1
Not shown: 994 closed ports
PORT     STATE SERVICE
22/tcp   open  ssh
25/tcp   open  smtp
80/tcp   open  http
111/tcp  open  rpcbind
443/tcp  open  https
3306/tcp open  mysql

Nmap done: 1 IP address (1 host up) scanned in 0.07 seconds

OPTIONS="-l 127.0.0.1,::1" --> OPTIONS="-l 0.0.0.0,::1"
systemctl restart httpd ; systemctl restart memcached