hi alex!
imageio-proxy isnt installed. Only ovirt-imageio service is running. (ovirt 4.4 now, i made the update)
If I run the following I get:
[root@engine ~]# systemctl | grep image
ovirt-imageio-proxy.service
Then checking the status of the service I confirm it is up:
systemctl status ovirt-imageio-proxy.service
If the service is up and ok then you need to check the certificate issue. I had noticed some times that importing the cert form GUI had not resolved the issue. You may try to manually get the CA cert from engine (/etc/pki/ovirt-engine/ca.pem) and import it at your browser. Clean cache at browser and try again. The browser should indicate the connection is trusted and secure. Also, you might need to remove the already imported cert from your browser.
when i connecto to the web UI, it say the certificate is not valid. with a red warning. but, i have already added the certificate to chrome