cinder create encrypted volume fails

[Rima Khoury]

***using openstack/Rocky

I am trying to create an encrypted volume using cinder/openstack CLI commands.
I have configure the key_manager in cinder.conf to have backend=barbican. also followed the documentation provided by openstack in this link:
https://docs.openstack.org/cinder/rocky/configuration/block-storage/volume-encryption.html

but when I run the create command I get the following error:
[stack@undercloud (overcloudrc) ~]$ openstack volume create --size 1 --type LUKS_ceph luks-1
The server has either erred or is incapable of performing the requested operation. (HTTP 500) (Request-ID: req-1c8beaa2-0079-4a9c-bba6-40c8e4d6c7f8)

cinde-volume.log does not show any errors and the cinde-api.log shows the following:

ERROR cinder.api.middleware.fault File "/usr/lib/python2.7/site-packages/keystoneauth1/session.py", line 907, in _send_request
ERROR cinder.api.middleware.fault raise exceptions.SSLError(msg)
ERROR cinder.api.middleware.fault SSLError: SSL exception connecting to https://172.17.1.12:9311: hostname '172.17.1.12' doesn't match either of '10.5.176.100', '10.5.176.100', 'instack.localdomain', 'vip.localdomain', '172.17.1.25'
ERROR cinder.api.middleware.fault

barbican and keystone logs does not show any errors.

configurations:
cinder.conf

[key_manager]
backend = barbican
[barbican]
barbican_endpoint = https://172.17.1.12:9311
auth_endpoint = http://172.17.1.12:5000/v3
certfile = /etc/cinder/cinder-server.pem
keyfile = /etc/cinder/cinder-server.key
cafile = /etc/pki/ca-trust/source/anchors/ca-internal.crt.pem
[keystone_authtoken]
www_authenticate_uri=http://172.17.1.12:5000
auth_uri=http://172.17.1.12:5000
auth_type=password
auth_url=http://172.17.1.12:5000
username=cinder
password= <my cinder password>
user_domain_name=Default
project_name=service
project_domain_name=Default

barbican.conf configurations are more or less the same. I can add them later if needed.

Does someone have an idea of how to fix this?