Step-by-Step Guide to Fixing `net::ERR_SSL_PROTOCOL_ERROR` in Chrome for Local Nginx HTTPS Setup

Struggling with the `net::ERR_SSL_PROTOCOL_ERROR` in Chrome when setting up a local HTTPS environment with Nginx? This article walks you through a real-world debugging case. We'll guide you from checking common issues like certificate/key mismatches to using the `curl` command-line tool to pinpoint the root cause: a TLS protocol version mismatch. Finally, we provide the definitive Nginx configuration fix and share a best practice recommended by DP@lib00: using `mkcert` to effortlessly manage local development SSL certificates.