How I Fixed Spamhaus Blocking My Mail Server & Switched to Barracuda DNSBL — A Step-by-Step Guide
If you run your own mail server, you may have run into a frustrating problem:legitimate senders getting blocked by Spamhaus,…
OpenBSD for Linux Sysadmins – Ultimate Cheatsheet & Transition Guide
📌 Core Differences You Should Know Feature Linux OpenBSD Init system systemd/sysvinit BSD init (/etc/rc) Package manager apt, yum, dnf,…
How to Check If a Linux User or Group Exists — with Examples and How to Delete Them Safely
Managing users and groups is a key part of Linux system administration. Whether you’re cleaning up old accounts or auditing…
How to Run Multiple PHP Versions on IIS 10 with FastCGI (PHP 8.1 to 8.4)
Introduction Running multiple PHP versions (e.g., 8.1 to 8.4) side-by-side on IIS 10 allows web admins to host different applications…
Pahalgam Attack and the Cancer of Terrorism from Pakistan
On 22 April 2025, a terrorist attack at Baisaran Valley near Pahalgam in the Anantnag district of Jammu and Kashmir,…
A Comprehensive Guide to IANA Certified Ports and Their Usage
🔎 Introduction: In today’s interconnected world, port numbers are essential for directing network traffic to the right applications. The Internet…