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Fix ERR_CERT_AUTHORITY_INVALID on Localhost - How to Fix Cloudflare 521 Error During Setup-Docker Compose Environment Variable Override Not Working: Fixes & Checks

2026-07-28 13:00:39
Fix ERR_CERT_AUTHORITY_INVALID on Localhost - How to Fix Cloudflare 521 Error During Setup-Docker Compose Environment Variable Override Not Working: Fixes & Checks

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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