剛使用 https://term.ptt.cc 連線失敗，
故測試提供 websocket 連線之 web server 服務本身是否開啟，發現:
$ curl -L https://ws.ptt.cc [7:19:29]
curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.se/docs/sslcerts.html
curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.
使用 Firefox 查看其 web server 本身是否能提供服務，顯示:
https://i.imgur.com/ruNM8jE.png
煩請協助檢查憑證自動更新設定是否失效，謝謝！