DNS

Common Problems 117000

Ubuntu 22.04 LTS Cloud-Init Overwrites Manual Network Configuration

🟡 Medium   ⏱ 5–30 min  Last verified: 2 January 2024 📖 ~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 MySQL 8 on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Install MySQL 8 on CentOS Stream 9

Introduction How to Install MySQL 8 on CentOS Stream 9 on CentOS Stream 9 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration is […]

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Common Problems 120134

Debian 12 Hostname Resolution Warning sudo unable to resolve host

🟢 Low   ⏱ 5–30 min  Last verified: 1 January 2024 Affected versions: Debian 12 📖 ~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 Configure Nginx WebSocket Proxying on FreeBSD 14 — step-by-step FreeBSD 14 tutorial on Progressive Robot

How to Configure Nginx WebSocket Proxying on FreeBSD 14

Introduction Deploying configure nginx websocket proxying on freebsd 14 on a FreeBSD 14 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard […]

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Debian 12 — dnsmasq — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — dnsmasq — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 1 January 2024 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2005-0876 CVE-2005-0877 CVE-2006-2017 CVE-2008-1447 CVE-2008-3214 CVE-2008-3350 CVE-2009-2957 CVE-2009-2958  +12 more Upstream summary: Off-by-one buffer overflow in Dnsmasq before 2.21 may allow attackers to execute arbitrary code via the […]

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Common Problems 117065

Ubuntu 22.04 LTS – MySQL login fails after auth plugin mismatch – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 1 January 2024 Affected versions: Ubuntu 22.04 LTS 📖 ~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 Configure ZFS on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Configure ZFS on Debian 12

Introduction Debian 12 Bookworm is built around the ethos of stability and free software. Setting up configure zfs on debian 12 on Bookworm leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Bookworm freeze. Follow each step carefully and the resulting […]

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How to Install and Configure ufw Firewall on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Install and Configure ufw Firewall on Debian 12

Introduction Deploying install and configure ufw firewall on debian 12 on a Debian 12 Bookworm 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 Ensure […]

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NetBSD 9.4 — djbdns — vulnerability — patch and remediation guide — diagnosis and fix on NetBSD 9.4

NetBSD 9.4 — djbdns — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: NetBSD 9.4 📖 ~4 min read  •  Source: pkgsrc audit-packages entry Related CVEs: CVE-2008-4392 Upstream summary: pkgsrc audit-packages flagged djbdns<1.05nb9 for vulnerability class 'cache-poisoning'. Reference: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4392 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis […]

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CentOS Stream 9 — python-dns — vulnerability — patch and remediation guide — diagnosis and fix on CentOS Stream 9

CentOS Stream 9 — python-dns — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 31 December 2023 Affected versions: CentOS Stream 9 📖 ~4 min read  •  Source: AlmaLinux/RHEL advisory ALSA-2024:9423 Related CVEs: CVE-2023-29483 Upstream summary: The python-dns package contains the dnslib module that implements a DNS client and additional modules that define certain symbolic constants used by DNS, such as […]

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