Nginx Proxy Manager continues to serve old certificates even after successful renewal—measured 2.15.1 and 2.16.0 by serial number of served certificates

Issue 5943 (filed 2026-10-13) reports that even after renewing a Let's Encrypt certificate, nginx continues to serve the old ...
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An expert explains based on actual examples about Nginx's common setting mistakes that have a huge hole in security just by the presence or absence of a slash

the top share in the industry as of June 2023. In such Nginx settings, the difference between adding a single slash and not adding a slash can create a big security hole. I explain it on my blog. In ...