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Fix Docker Compose Environment Variable Substitution Failed - Nginx Redirect Loop: Common Causes and Fixes-Nginx Permission Denied Upstream Error Fix

2026-07-28 12:55:16
Fix Docker Compose Environment Variable Substitution Failed - Nginx Redirect Loop: Common Causes and Fixes-Nginx Permission Denied Upstream Error Fix

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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