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Fix 'nginx configuration test failed invalid parameter' - Resolving Nginx Upstream Refused Errors with Cloudflare-How to Resolve ERR_NAME_NOT_RESOLVED with CMD

2026-07-28 07:59:30
Fix 'nginx configuration test failed invalid parameter' - Resolving Nginx Upstream Refused Errors with Cloudflare-How to Resolve ERR_NAME_NOT_RESOLVED with CMD

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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