Install SSL on a Linux Server

Installing an SSL certificate on a Linux server (like Ubuntu or CentOS) means configuring the web server software that is running on it. The two most common web servers are Apache and Nginx.

First, Identify Your Web Server

If you aren't sure which web server you are using, you can often find out by running the following command from your server's terminal:

sudo lsof -i :80

This command lists the processes listening on port 80 (HTTP). The output should show either `apache2` or `nginx`.

Choose Your Installation Guide

Once you know your web server, select the corresponding guide below for detailed, step-by-step instructions.

Apache Installation

For servers running the Apache HTTP Server.

Nginx Installation

For servers running the Nginx web server.

Verify the Installation

After following the correct guide, always verify your installation. Our free SSL Certificate Checker can scan your domain and confirm that the certificate is installed correctly and trusted by browsers.