The GitHub home page malfunctioned earlier this week, with reports that an expired SSL certificate was to blame. GitHub users reported that they were unable to access various resources, apparently because the SSL certificate issued on GitHub's content delivery network (CDN) was only valid until November 2, 2020 7:00 amET. Technically, the issue is known as a "mixed content issue" because GitHub's back-end server had a valid certificate, which meant that certain aspects of the site, such as textual content, were still working correctly. However, anything accessed from the standalone CDN server, including images and JavaScript files, could not be loaded. The outage lasted approximately 30 minutes before GitHub managed to acquire a new SSL certificate. The new certificate will expire in November 2021.