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Fix Docker Compose Environment Variable Substitution Failed - Resolve 521 Web Server Down with Firewall Changes-Troubleshooting Nginx Upstream Refused

2026-07-28 07:00:37
Fix Docker Compose Environment Variable Substitution Failed - Resolve 521 Web Server Down with Firewall Changes-Troubleshooting Nginx Upstream Refused

Result check

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

Next references

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