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Edit File: FPM_50x.html

<html>
    <head>
        <meta http-equiv="Content-type" content="text/html; charset=utf-8">
        <meta http-equiv="Cache-control" content="no-cache">
        <meta http-equiv="Pragma" content="no-cache">
        <meta http-equiv="Expires" content="0">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Error 502/503</title>
        <style type="text/css">
            body {
                font-family: Arial, Helvetica, sans-serif;
                font-size: 14px;
                line-height: 1.428571429;
                background-color: #ffffff;
                color: #2F3230;
                padding: 0;
                margin: 0;
            }
            section,footer {
                display: block;
                padding: 0;
                margin: 0;
            }
            .container {
                margin-left: auto;
                margin-right: auto;
                border: 1px solid #293a4a;
                margin-top: 50px;
                width: 70%;
            }
            .response-info {
                color: #eeeeee;
                padding: 20px;
                background-color: #293a4a;
            }
            .status-code {
                font-size: 500%;
            }
            .status-reason {
                font-size: 250%;
                display: block;
            }
            .response-message,
            .reason-text {
                color: #333333;
            }
            .response-message {
                margin-bottom: 20px;
                font-size: 16px;
                padding: 20px;
            }
            .response-message a {
                text-decoration: underline;
                color: #428BCA;
            }
            .response-message a:hover,
            .response-message a:focus,
            .response-message a:active {
                color: #2A6496;
            }
            footer {
                text-align: center;
                margin: 60px 0;
            }
            footer a {
                text-decoration: none;
            }
            footer a img {
                border: 0;
            }
            .copyright {
                font-size: 10px;
                color: #3F4143;
            }
            @media (max-width: 767px) {
                .container {
                    width: 100%;
                    margin-top: 0;
                }
                .response-info {
                    padding: 10px;
                }
                .response-message {
                    padding: 10px;
                }
            }
            @media (max-width: 1024px) and (min-width: 768px) {
                .container {
                    width: 90%;
                    margin-top: 0;
                }
            }
        </style>
    </head>
    <body>
        <div class="container">
            <section class="response-info">
                <div class="status-code">502/503</div>
                <div class="status-reason">An error has occurred while processing your request.</div>
            </section>
            <section class="response-message">
                <p>
                    Thanks for trying out nginx on cPanel! We’re sorry that you’re seeing this message.
                </p>
                <p>
                    The most common reason for this message is because PHP-FPM is not enabled on your domain. Contact your system administrator to check your domain’s settings. The system administrator can enable PHP-FPM in WHM’s MultiPHP Manager.
                </p>
                <p>
                    For more information, read our <a href="https://go.cpanel.net/MultiPHPManager" target="_blank">WHM MultiPHP Manager</a> documentation.
                </p>
            </section>
        </div>
        <footer>
            <div class="copyright">
                Copyright© <span id="currentYear"></span> cPanel, L.L.C.
                <a href="https://go.cpanel.net/privacy" target="_blank">Privacy Policy</a></p>
            </div>
        </footer>
        <script type="text/javascript">
            window.addEventListener("load", function(e){
                var yearEl = document.querySelector("#currentYear");
                if(yearEl !== null){
                    var year = new Date();
                    yearEl.innerHTML = year.getFullYear();
                }
            });
        </script>
    </body>
</html>