This article systematically breaks down the complete implementation of Nginx TCP Layer 4 port proxy and mTLS mutual encryption authentication. It covers core technical principles (TLS/mTLS mechanisms), certificate generation (root CA/server/client workflows), Nginx configuration (Stream module, SSL parameter optimization), and function verification (valid/invalid connection testing) with practical commands. It helps DevOps engineers and developers quickly…

Blocking IPs dynamically in Nginx can effectively protect websites or applications from malicious requests, crawlers, or DDoS attacks. Compared to the traditional static method of modifying the configuration file and reloading Nginx, dynamic IP blocking can automatically identify and block malicious IPs in real-time, greatly enhancing security and operational efficiency. This article will elaborate on…

As a web developer, have you ever overlooked the Host header in HTTP requests? This seemingly ordinary field, once exploited by attackers, can lead to serious security issues such as password reset hijacking, cache poisoning, and even Server-Side Request Forgery (SSRF). This article will start from the vulnerability principle and share 3 battle-tested Nginx defense…