After some wrangling with my WordPress-based site and moving some things around, I learned that I couldn't install a cert on my own because my webhost doesn't offer server control panel access to users. So I ended up having to have my webmaster install the cert for me on www.geekingoutabout.com and things seem to be okay.
I also used the Better Search Replace WP plugin to replace all instances of "http:" with "https:" in the wp_options, wp_postmeta, and wp_posts database tables.
Using @JuergenAuer's website checker which he linked in this thread to confirm that all the mixed content was gone, this is the result I got.
To which part (or section number) of the report do I go see if there are mixed content errors? I'm guessing that it's Section 11, but is that correct? How does a lay person read this report and what sections that are colored pink are safe to ignore?
All good questions. Many of us strongly suggested to Juergen on many occasions that he improve the clarity of his tool. The response we received from him regarding our feedback was less than pleasant.
Woot! The results from Missing Padlock are ones that I anticipated because I'd removed some posts that just don't exist on the site anymore and haven't yet removed the oldest stuff from 2008-2010. Why No Padlock says that there's an issue with the intermediate (bundle) certificate. What does that mean?
