The SSL certificate for the website planetkde.org expired as of October 4 2016. Hence, all visitors to the site receive cert error messages and need to allow exceptions in order to be able to view the web page
Steps to Reproduce:
1. open web browser of choice
2. visit planetkde.org
The following error message is displayed on firefox:
Your connection is not secure
The owner of planetkde.org has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.
This has now been resolved.