Cloudflare 522 Error: Server Response Time Troubleshooting
You're browsing a site and get a Cloudflare 522 error—'Connection timed out' or '...
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Setup Cloudflare Origin Certificate for Nginx
If you use Cloudflare as a reverse proxy, enabling HTTPS between Cloudflare and your Nginx server...
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If you see Cloudflare error 521, your origin server is not responding to Cloudflare's request...
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