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Docker Compose Environment Variable Not Set in Container: Fixes - How to Fix Chrome ERR_CONNECTION_RESET with DNS Flush-Resolve 521 Web Server Down with Firewall Changes

Updated 2026-07-28 16:28:04macos-help
Docker Compose Environment Variable Not Set in Container: Fixes - How to Fix Chrome ERR_CONNECTION_RESET with DNS Flush-Resolve 521 Web Server Down with Firewall Changes
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.