Configure Horizon

Make the following changes in /etc/openstack-dashboard/local_settings.py

If you are using devstack, the file location would be in /opt/stack/ directory.

OPENSTACK_KEYSTONE_URL = "http://keystoneopenam.com:5000/v3”

OPENSTACK_API_VERSIONS = {
         "identity": 3
         }

WEBSSO_ENABLED = True

WEBSSO_CHOICES = (
    ("credentials", _("Keystone Credentials")),
    ("oidc", _("OpenID Connect")))
WEBSSO_INITIAL_CHOICE = "credentials"

Now restart the server

service apache2 restart