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Cloudflare 521 Error: Server Timeout – Causes and Fixes - How to Solve Nginx Upstream Permission Denied-How to Fix 'Unable to Get Local Issuer Certificate' in Git

Updated 2026-07-28 13:52:32browser-issues
Cloudflare 521 Error: Server Timeout – Causes and Fixes - How to Solve Nginx Upstream Permission Denied-How to Fix 'Unable to Get Local Issuer Certificate' in Git
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.

More repair notes

Fix npm run build Permission Denied on LinuxFix Firefox Secure Connection Failed DNS ErrorFix Git Push Non-Fast-Forward and Permission Denied ErrorsFix VS Code IntelliSense Not Working After UpdateFixing Nginx Upstream Connection Refused on Port 443Fix Windows 11 Update Stuck at 0% with Service Not Running