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Fixing Cloudflare 521 Error: Origin Unreachable - Fix VSCode Debugger Breakpoints Not Working After Update-Nginx 502 Bad Gateway Docker: Causes and Solutions

Updated 2026-07-28 13:32:50developer-tools
Fixing Cloudflare 521 Error: Origin Unreachable - Fix VSCode Debugger Breakpoints Not Working After Update-Nginx 502 Bad Gateway Docker: Causes and Solutions
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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