Server Security Archives

Networking tutorial - IT technology blog

Building an Automated DDoS Detection and Response System with FastNetMon

July 5, 2026

FastNetMon is a traffic analysis daemon that detects volumetric DDoS attacks in seconds and automatically triggers iptables blocks or BGP blackholing. This guide walks through setting it up on a Linux server with automated response scripts — no cloud scrubbing service required.

Linux

Mastering ssh-agent and SSH Key Forwarding on Linux: Manage Multiple Keys and Chain Servers Securely

June 29, 2026

Managing multiple SSH keys across servers gets messy fast. This guide lays out four approaches — from a single shared key to ssh-agent with forwarding — with honest trade-offs for each, then walks through the full setup for chaining server connections securely while keeping private keys on your local machine.

Security

Identity-Based SSH: Why I Finally Closed Port 22 and Ditched Key Management

May 12, 2026

Is SSH key management slowing you down? Switch to identity-based authentication with Tailscale. Close Port 22, use your SSO for access, and simplify your server security in under 20 minutes.

Security

Installing & Configuring ModSecurity WAF for Apache/Nginx Web App Protection

March 29, 2026

Learn how to install and configure ModSecurity WAF for both Apache and Nginx web servers. This guide covers core concepts, detailed setup instructions, and essential best practices to protect your web applications from common cyber threats like SQL injection and XSS.

Linux

How to Secure SSH Server: Disable Root Login and Set Up Key-Based Authentication

March 15, 2026

Default SSH configuration leaves your server exposed to brute-force attacks. This guide walks through disabling root login, setting up key-based authentication, and validating your SSH hardening configuration on Ubuntu/Debian servers.

Security

How I Detect and Prevent Brute-Force Attacks (A 6-Month Review)

March 10, 2026

A midnight brute-force attack forced me to get serious about server security. For the last six months, a layered strategy using Fail2ban and SSH keys has kept my systems secure and silent. This guide details my practical, battle-tested setup so you can do the same.