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I don't believe this is a problem with your Horizon configuration. The "Connection refused" error appears to come from the Cinder Volume Service. Check that the volume (block storage) endpoints are correct in your keystone catalogue, that the cinder service is up and running, and also that it is accessible (firewall, etc) from the machine running Horizon.

Hope this helps!

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Single-node installation, removing firewall comment

I don't believe this is a problem with your Horizon configuration. The "Connection refused" error appears to come from the Cinder Volume Service. Check that the volume (block storage) endpoints are correct in your keystone catalogue, catalogue and that the cinder service is up and running, and also that it is accessible (firewall, etc) running. Does "cinder list" work from the machine running Horizon.command line?

Hope this helps!

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updated the answer to include details found in the comments

I don't believe this is a problem with your Horizon configuration. The "Connection refused" error appears to come from the Cinder Volume Service. Check that the volume (block storage) endpoints are correct in your keystone catalogue and that the cinder service is up and running. Does "cinder list" work from the command line?

Hope this helps!Horizon assumes cinder is installed based on your Keystone service catalogue. If Cinder doesn't exist and is handled by nova, you should remove the cinder/volume endpoints from the catalogue, and Horizon will talk to nova-volume instead. If the tutorial doesn't go into installing Cinder then a bug should probably be filed against openstack-manuals to remove the Volume endpoint creation in the "Creating keystone services and service endpoints" section.