Tag: networking

The Firewall Rule Order That's Breaking Your Setup

Firewall rules are evaluated top-down, first match wins. One misplaced ALLOW rule silently defeats all security.

Is fail2ban Actually Working? Here's How to Check

Verify fail2ban is protecting you: check jails, test bans, monitor logs, common misconfiguration, and unban IPs when needed.

SSHFS: Ditch SCP & Access Remote Files

SSHFS mounts remote filesystems over SSH so you can browse and edit files locally — faster than scp for interactive work.

Why Your SSH Connection Keeps Dropping

Fix SSH timeouts: ServerAliveInterval, ServerAliveCountMax, ClientAliveInterval. Understand NAT, firewalls, and TCP keepalive.

lsof: The Tool That Shows You Everything

Master lsof to find port conflicts, trace deleted files eating disk, and debug network connections.

Finding the PID of a Process Using a Specific Port in Linux

Something's squatting on port 8080 and you need to know what. ss, lsof, and fuser one-liners to find and kill the culprit fast.

Certificate Pinning: A Secure Connection Guide

Certificate pinning locks your app to a specific TLS cert so MITM attackers can't swap in a rogue CA — how it works and when to use it.

Docker Networking Essential Guide for All Skill Levels

Bridge, host, overlay, macvlan, and none — every Docker network mode explained with real use cases from beginner to production.

WordPress, Docker, NGINX, and MySQL via Ansible

Automate a full WordPress stack deployment — Docker, nginx, and MySQL — using Ansible playbooks instead of clicking through wizards.

How to securely deploy Cloudflare Tunnels

Cloudflare Tunnels expose local services to the internet without open ports — secure setup with zero-trust access controls.

SSH Tunneling: A Secure Conduit for Your Data

SSH tunnels forward ports over encrypted connections — local forwarding, remote forwarding, and dynamic SOCKS proxy explained.