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How to Fix Node Version Mismatch in a Project - Fix Cloudflare 521 Error by Adjusting Firewall-Troubleshooting Port Already Allocated in Docker Compose

Updated 2026-07-28 12:01:19developer-tools
How to Fix Node Version Mismatch in a Project - Fix Cloudflare 521 Error by Adjusting Firewall-Troubleshooting Port Already Allocated in Docker Compose
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.