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Docker Compose Env Variable Not Available in Container: Fix - Troubleshoot 502 Bad Gateway in Docker Nginx-Fix Missing Taskbar Icons on a Second Monitor

Updated 2026-07-28 05:42:56backup-recovery
Docker Compose Env Variable Not Available in Container: Fix - Troubleshoot 502 Bad Gateway in Docker Nginx-Fix Missing Taskbar Icons on a Second Monitor
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.