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How to configure Lighttpd web server with free Let’s Encrypt SSL certificate on Debian or Ubuntu Linux

Let’s Encrypt is a free, automated, and open certificate authority for your website or any other projects. You can grab free TLS/SSL certificate to create encrypted HTTPS session for your site visitors. In this tutorial, I will explain how to use Let’s Encrypt to install a free SSL certificate for Lighttpd web server along with how to properly deploy Diffie-Hellman on your Lighttpd server to get SSL labs A+ score.