建置環境

Linode 4GB + CentOS

$20/mo($.03/hr)
4 GB RAM
2 CPU Cores
48 GB SSD Storage
3 TB Transfer
40 Gbps Network In
1000 Mbps Network Out

錯誤訊息

登入 Plesk 控制台「網站與域名」出現  Internal error ;-P  以及以下訊息：

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>502 Bad Gateway</title>
<link rel="stylesheet" href="/error_docs/styles.css">
</head>
<body>
<div class="page">
<div class="main">
<div class="error-description">
<h1>Server Error</h1>
<div class="error-code">502</div>
<h2>Bad Gateway</h2>
<p class="lead">Web server received an invalid response while acting as a gateway or proxy server.</p>
<hr/>
<p>If you think this is an error, please <a href="https://www.plesk.com/bug-report/" target="_blank">let us know</a> so we can fix it!</p>
<p>That's what you can do</p>
<div class="help-actions">
<a href="javascript:location.reload();">Reload Page</a>
<a href="javascript:history.back();">Back to Previous Page</a>
<a href="/">Home Page</a>
</div>
</div>
<div class="help-links">
<a href="https://www.plesk.com/bug-report/" class="help-link" title="Report a problem" target="_blank">
<div class="icon report"><svg><use xlink:href="/error_docs/symbols.svg#report"></use></svg></div>
</a>
<a href="https://docs.plesk.com/" class="help-link" title="Documentation" target="_blank">
<div class="icon documentation"><svg><use xlink:href="/error_docs/symbols.svg#documentation"></use></svg></div>
</a>
<a href="https://kb.plesk.com/" class="help-link" title="Knowledge base" target="_blank">
<div class="icon knowledge-base"><svg><use xlink:href="/error_docs/symbols.svg#knowledge-base"></use></svg></div>
</a>
<a href="https://talk.plesk.com/" class="help-link" title="Forum" target="_blank">
<div class="icon forum"><svg><use xlink:href="/error_docs/symbols.svg#forum"></use></svg></div>
</a>
<a href="https://www.youtube.com/channel/UCeU-_6YHGQFcVSHLbEXLNlA" class="help-link" title="YouTube" target="_blank">
<div class="icon youtube"><svg><use xlink:href="/error_docs/symbols.svg#youtube"></use></svg></div>
</a>
<a href="https://www.facebook.com/Plesk" class="help-link" title="Facebook" target="_blank">
<div class="icon facebook"><svg><use xlink:href="/error_docs/symbols.svg#facebook"></use></svg></div>
</a>
</div>
</div>
</div>
<script defer src="/error_docs/svgxuse.min.js"></script>
</body>
</html>

其他症狀

  • 檔案存在但網站顯示 502 Bad Gateway 或 404 Not Found
  • 網站嘗試透過 HTTPS 連接或重新導向到其他網站時顯示 502 Bad Gateway
  • Apache 服務正在運行

原因

Web 服務器設定檔已損壞、不存在或模組未載入

解決方法

停用 Nginx 服務：

# /usr/local/psa/admin/bin/nginxmng --disable

將所有 vhost 的設定檔從 /etc/nginx/plesk.conf.d/vhosts 移動到臨時目錄：

＃mkdir / root / support_plesk && mv /etc/nginx/plesk.conf.d/vhosts/* / root / support_plesk

啟動 Nginx 服務：

# /usr/local/psa/admin/bin/nginxmng --enable
# /usr/local/psa/admin/bin/nginxmng --status
Enabled

或使用 Plesk 介面：

Plesk 控制台 > 工具與設定 > 服務管理 > 反向代理伺服器（nginx） > 停止服務 > 啟動服務

確定 Apache 模組 cgid 已經啟用：

Plesk 控制台 > 工具和設定 > Apache Web 伺服器