Comment 6 for bug 1697634

Hello.
I also experienced a similar case at Ussuri on CentOS8.
It has been fixed by the following changes.
I recommend checking to your horizon's local_settings.
```
(1) ErrorLog
----
$ sudo grep 'AH01630' /var/log/httpd/error_log | tail -n 1
[Sun Aug 02 19:01:26.551032 2020] [authz_core:error] [pid 8331:tid 140194208229120] [client 192.168.3.200:35800] AH01630: client denied by server configuration: /usr/bin/keystone-wsgi-public
$
----

(2) Fix Config
----
/etc/openstack-dashboard/local_settings
OPENSTACK_HOST = "controller ip address."
- OPENSTACK_KEYSTONE_URL = "http://%s/identity/v3" % OPENSTACK_HOST
+ OPENSTACK_KEYSTONE_URL = "http://%s:5000/identity/v3" % OPENSTACK_HOST
----

(3) My Environment
CentOS 8 + Ussuri
----
$ cat /etc/redhat-release
CentOS Linux release 8.2.2004 (Core)
$ rpm -q openstack-dashboard
openstack-dashboard-18.3.2-1.el8.noarch
----
```
regards.