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 parameter 'auth_protocol' under [keystone_authtoken] section in /etc/nova/nova.conf is to 'https' or set the value of parameter 'identity_uri' under [keystone_authtoken] section in /etc/nova/nova.conf is to the Identity API endpoint starting with https://.