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Fix ERR_NAME_NOT_RESOLVED DNS Configuration Error - How to Stop Docker Build Context Canceled Errors-Troubleshoot Nginx Upstream Connection Refused

Updated 2026-07-28 07:01:42security-tools
Fix ERR_NAME_NOT_RESOLVED DNS Configuration Error - How to Stop Docker Build Context Canceled Errors-Troubleshoot Nginx Upstream Connection Refused
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.