On September 30, 2021, Letsencrypt’s DST Root CA X3 cross-sign (by IdentTrust) root certificate expired and was replaced with Letsencrypt’s own ISRG Root X1 CA root certificate. I’ll outline how Centmin Mod LEMP stack handled the Letsencrypt’s DST Root CA X3 certificate expiration for CentOS 7.x operating systems.
Configserver CSF Firewall Shutdown on August 31, 2025
On August 31, 2025, the Linux server administration community witnessed the end of an era as ConfigServer Security & Firewall (CSF) officially shut down after 20+ years of service. For hundreds of thousands of servers worldwide, CSF wasn’t just another utility – it was the cornerstone of their security infrastructure. The shutdown left many scrambling …