Mixed content error when trying to open /cms

The problem is that when we log in to the BR CMS we get a mixed content error.

The site is https but it appears that the when the browser finds a http request in the https landing page it refuses to call these URLs and we get connection timeout and in the developer tools console we see the mixed content error. The browser we use is chrome.

So far the only workaround we’ve found is in Firefox in the configs to enable https_only_mode and https_only_mode_ever_enabled. The project runs on AWS cloud.