If you have SSL enabled on an Apache server running on Mac OS X, you may have found that upgrading to 10.10.5 breaks your site, and your users cannot connect either via http or https.
It turns out the update moves the certs and keys to a new folder, so references to those certs are then broken.
To fix the issue, edit the /private/etc/apache2/extra/httpd-ssl.conf file:
Then, save the file and restart your Apache server:
Thanks to stamps-uk from Yosemite 10.10.5 Update Disabled Apache for the tip.