I get a 521 error when I tried to access my page.

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JasonChui
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Hi, I am using Cloudflare as a CDN. I have had no trouble with the CDN until today. Right now, I am getting a 521 error when I tried to access it (e.g. https://support.cloudflare.com/hc/en-us/articles/200171916-Error-521)

Is there any configuration that I am missing out that would make the connection work?
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JeffMa
Hello JasonChui, Currently when visiting your site, everything works fine for me. That said, it may only be a single location within CloudFlare's network that is causing issues which could be why you are seeing it and I am not. To resolve the issue, I recommend contacting live technical support in which they will be able to better diagnose the location that is being blocked while you are attempting to access the site. Best regards, JeffMa