The following promotion pages are with the "Connection is not secure" error.
- https://contests.stackoverflow.com/promos/1
- https://contests.stackoverflow.com/promos/2
- https://contests.stackoverflow.com/promos/3
- https://contests.stackoverflow.com/promos/4
- https://contests.stackoverflow.com/promos/5
- https://contests.stackoverflow.com/promos/6
- https://contests.stackoverflow.com/promos/7
- https://contests.stackoverflow.com/promos/8
- https://contests.stackoverflow.com/promos/9
- https://contests.stackoverflow.com/promos/11
The error description in detail:
Connection is Not Secure
Parts of this page are not secure (such as images).
Due to some of the image files are in those pages are in http://, that caused the issue.
http://www.gravatar.cominstead of https.