Certbot --nginx fails when port forwarding mismatches nginx
Certbot --nginx gets 404s or connection failures because router port forwarding and nginx listen blocks do not match.
Tier II · Emerging Problems that are still building up.
8 public reports · first reported 7 September 2026 · last reported 7 September 2026
What's going wrong
Home-server owners running Certbot with the --nginx plugin often get 404 errors or connection failures when requesting a Let's Encrypt certificate.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 8 reports are about, and how many came each month.
- Related problems.
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