Error 521 Web Server Is Down

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Posted August 17, 23:41

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The website is suddenly inaccessible, and the front-end error message is displayed 521 Web Server Is Down. This hangs up, what do I do with it, and I'll look elsewhere that one for ways to do it.

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- jingwei0
  server downtime
  August 25, 10:33return (to a previous condition)
- lit. the spring breeze greets the south bank of the Yangtze River again0
  Test direct access to the source site, in the browser or terminal directly through the server IP or domain name (bypassing the CDN), for example: curl -v http://你的服务器IP If direct access also fails → the problem is with the server itself. If direct access succeeds → the problem is with the CDN or an intermediate layer (e.g. Cloudflare).
  August 18, 11:37return (to a previous condition)
  report (malefactors to the police)