Often when creating web pages designed for using SSL Certificates, there will be a mix of secure and insecure content in the web page that will prompt a browser warning to the user of the web page. The insecure content will often be a mix of images, external sources or internal links. Searching through the source code to find the cause of insecure content can often be difficult and time consuming depending on the amount of code in the page.
Using a tool like Why No Padlock can be of great benefit when trouble shooting the insecure content warnings. Simply type in the url of the page you wish to check in the box and the tool will display the sources of any insecure content.
The image below is an example of a secure page that displays all content securely and will not display any insecure content warnings. When testing a page that does have insecure content warnings, the elements that are displaying insecurely will be included in the summary.
Insecure Content Warning Examples: