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Fix Docker Compose Environment Variable Substitution Failed - Nginx PHP-FPM Connection Refused: How to Fix-Troubleshooting Cloudflare 522 Timeout Errors

2026-07-28 14:01:55
Fix Docker Compose Environment Variable Substitution Failed - Nginx PHP-FPM Connection Refused: How to Fix-Troubleshooting Cloudflare 522 Timeout Errors

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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