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Guides from the NOC

Written from running the hardware — what breaks, why, and the command that fixes it.

3 posts matching “iptables” · Clear

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VPS Firewalld on AlmaLinux: A VPS Firewall Setup Guide

UFW commands don't work on AlmaLinux. Learn firewalld zones, firewall-cmd basics, and how to secure a fresh AlmaLinux or CentOS VPS without locking yourself...

30 July 2026 · 7 min · 8 views VPS Docker Bypassing Your UFW Firewall? Here's the Real Fix

Published Docker container ports staying open even after UFW denies them? Learn why Docker bypasses UFW via iptables, and how to actually lock it down.

30 July 2026 · 7 min · 9 views VPS VPS Firewall Basics: Set Up UFW and Close Open Ports

Learn how to set up UFW on your VPS, allow only the ports you need, and stop random port scans from finding an open door into your server.

12 July 2026 · 6 min · 2 views