Firewall

How to Configure the pkg Package Manager on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Configure the pkg Package Manager on FreeBSD 12

Introduction FreeBSD 12 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up configure the pkg package manager on freebsd 12 on FreeBSD 12 follows the rc.conf/service(8) paradigm rather than systemd, which means enabling a service and configuring its startup options are done differently from any […]

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How to Configure OSPF with Quagga on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure OSPF with Quagga on Debian 10

Introduction Debian 10 Buster is built around the ethos of stability and free software. Setting up configure ospf with quagga on debian 10 on Buster leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Buster freeze. Follow each step carefully and […]

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How to Set Up TeamCity on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Set Up TeamCity on Debian 9

Introduction Deploying set up teamcity on debian 9 on a Debian 9 Stretch machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites You will need […]

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openSUSE Tumbleweed — firewalld — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — firewalld — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2016-5410 Upstream summary: firewalld.py in firewalld before 0.4.3.3 allows local users to bypass authentication and modify firewall configurations via the (1) addPassthrough, (2) removePassthrough, (3) […]

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How to Set Up SFTP Server with Chroot Jail on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Set Up SFTP Server with Chroot Jail on Debian 10

Introduction Debian 10 Buster is built around the ethos of stability and free software. Setting up set up sftp server with chroot jail on debian 10 on Buster leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Buster freeze. Follow each […]

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Common Problems 121124

Debian 10: UFW blocks required application ports

🟡 Medium   ⏱ 5–30 min  Last verified: 19 February 2020 Affected versions: Debian 10 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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How to Enable Brotli Compression on Nginx on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Enable Brotli Compression on Nginx on Debian 10

Introduction How to Enable Brotli Compression on Nginx on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian […]

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Common Problems 118507

Ubuntu 16.04 LTS Apache2 fails to start because port 80 is in use

🟡 Medium   ⏱ 5–30 min  Last verified: 19 February 2020 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & Cross-Refs References & Further […]

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How to Install and Configure Drone CI on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install and Configure Drone CI on RHEL 7

How to Install and Configure Drone CI on RHEL 7 Drone CI is a lightweight, container-native continuous integration platform built around the concept of pipelines-as-code. Unlike Jenkins, which requires significant plugin management and XML configuration, Drone uses a simple YAML file (.drone.yml) stored in your repository to define every aspect of a pipeline. Drone’s server […]

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How to Configure Trusted Execution on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Configure Trusted Execution on IBM AIX 7.1

Introduction IBM AIX 7.1 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to configure trusted execution on ibm aix 7.1 on IBM […]

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