What are the common reasons for SSL connections not being enforced when accessing a website via HTTP?

When SSL connections are not enforced when accessing a website via HTTP, it can leave the website vulnerable to security threats such as man-in-the-middle attacks. This can happen due to misconfiguration of the server, incorrect redirection rules, or outdated SSL certificates. To solve this issue, you can enforce SSL connections by redirecting all HTTP traffic to HTTPS using server-side configuration or by adding a code snippet to your website to automatically redirect users to the secure HTTPS version. 

// Force SSL redirection
if ($_SERVER['HTTPS'] != 'on') {
    header('Location: https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']);
    exit();
}

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