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Docker Compose Environment Variable Not Working: Fixes - Nginx Cloudflare 521 Troubleshooting Guide-Fix 'network not found' Error in Docker on Linux

2026-07-28 23:03:37
Docker Compose Environment Variable Not Working: Fixes - Nginx Cloudflare 521 Troubleshooting Guide-Fix 'network not found' Error in Docker on Linux

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.

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