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Cloudflare Error 521: Web Server Down Checklist - Chrome Using Too Much Memory? Here's How to Fix It-Fixing Nginx Connection Refused to Upstream

Updated 2026-07-28 13:00:54office-tools
Cloudflare Error 521: Web Server Down Checklist - Chrome Using Too Much Memory? Here's How to Fix It-Fixing Nginx Connection Refused to Upstream
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

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