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Fix Cloudflare 521 Error on Nginx: Step-by-Step Guide - Fix Firefox Secure Connection Failed on Mac-How to Fix Git SSL Certificate Problem on Windows

Updated 2026-07-28 13:37:45browser-issues
Fix Cloudflare 521 Error on Nginx: Step-by-Step Guide - Fix Firefox Secure Connection Failed on Mac-How to Fix Git SSL Certificate Problem on Windows
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.

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