[ovirt-users] Add External Provider - OpenStack Glance - Test Failed - "Failed to communicate with the External Provider"

We have installed Ovirt Manager 4.3 with couple of KVM compute host added into cluster. When we add OpenStack Glance as an External Provider, failing with following error message  - "Failed to communicate with the External Provider" We are able to add the external provider for Openstack Neutron and Openstack Cinder and import the storage and network in to ovirt manager and use it for vm. We are getting following error message on engine.log file "Failed with error PROVIDER_FAILURE and code 5050". But we are able to fetch the images using postman tool. Requesting you to provide some insights on adding the Glance provider.