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Docker Compose Environment Variable Not Set in Dockerfile - Nginx 502 Upstream Connection Refused Guide-How to Fix DNS Probe Finished NXDOMAIN

2026-07-28 15:02:02windows-fixes
Docker Compose Environment Variable Not Set in Dockerfile - Nginx 502 Upstream Connection Refused Guide-How to Fix DNS Probe Finished NXDOMAIN

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.

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