Information
OpenStack components communicate with each other using various protocols and the communication might involve sensitive / confidential data. An attacker may try to eavesdrop on the channel in order to get access to sensitive information. Thus all the components must communicate with each other using a secured communication protocol.
Solution
Set the value of parameter glance_api_insecure under [DEFAULT] section in /etc/nova/nova.conf to False or set the value of parameter api_insecure under [glance] section in /etc/nova/nova.conf to False