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Nginx Upstream Connection Refused: Diagnosis and Fixes - Resolving Git Merge Conflict Code 128-Troubleshoot Cloudflare 521 for Wildcard Subdomains

Updated 2026-07-28 14:05:34developer-tools
Nginx Upstream Connection Refused: Diagnosis and Fixes - Resolving Git Merge Conflict Code 128-Troubleshoot Cloudflare 521 for Wildcard Subdomains
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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