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Docker Compose Environment Variable Not Working: Fixes - How to Resolve Port Already in Use in Docker Compose-Nginx 502 Bad Gateway in Docker: How to Fix

Updated 2026-07-28 17:33:43office-tools
Docker Compose Environment Variable Not Working: Fixes - How to Resolve Port Already in Use in Docker Compose-Nginx 502 Bad Gateway in Docker: How to Fix
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.

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