https://community.cloudflare.com/t/community-tip-fixing-error-521-web-server-is-down/42461
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Error Try the suggestions in this Community Tip to help you fix Error 521: Web server is down. Background A 521 error happens when we are unable to make a TCP connection to your origin server. Specifically, Cloudflare tried to connect to your origin server on port 80 or 443, but received a connection refused error. This is often caused by sec...
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