<html>We have a setup with ovirt 4.0.4 (hosted engine) and I try to import a Ubuntu qcow cloud image. When I try to import, it stops with the error 'Unable to upload image to disk ... due to a network error. Make sure ovirt-imageio-proxy service is installed and configured, and ovirt-engine's certificate is registered as a valid CA in the browser'.<br /><br />The ovirt-imageio-proxy service is running on the engine. No errors in the log (just a mention that the service has started up). I also imported the server CA in my browser (Firefox 49 on Ubuntu).</html>