DNS

Common Problems 120639

Debian 11 IPv6 Misconfiguration Causes Dual-Stack Outages

🟠 High   ⏱ 5–30 min  Last verified: 10 July 2022 Affected versions: Debian 11 📖 ~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 OpenDKIM with Postfix on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure OpenDKIM with Postfix on Debian 9

Introduction Deploying configure opendkim with postfix 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 […]

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Common Problems 116994

Ubuntu 22.04 LTS systemd Service Fails with status=203/EXEC

🟡 Medium   ⏱ 5–30 min  Last verified: 10 July 2022 📖 ~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 Configure SaltStack on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Configure SaltStack on Debian 11

Introduction Deploying configure saltstack on debian 11 on a Debian 11 Bullseye 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 Before you begin, ensure […]

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Ubuntu 22.04 — pdns-recursor — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 22.04

Ubuntu 22.04 — pdns-recursor — multiple vulnerabilities (6 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 9 July 2022 Affected versions: Ubuntu 22.04 (jammy) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7203-1 Related CVEs: CVE-2018-1046 CVE-2018-10851 CVE-2018-14626 CVE-2018-14644 CVE-2020-17482 CVE-2022-27227 Upstream summary: Wei Hao discovered that PowerDNS Authoritative Server incorrectly handled memory when accessing certain files. An attacker could possibly use […]

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Common Problems 118558

Apache2 fails with AH00558 and startup warnings

🟡 Medium   ⏱ 5–30 min  Last verified: 8 July 2022 📖 ~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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Common Problems 116982

Ubuntu 22.04 disk space fills quickly from logs

🟡 Medium   ⏱ 5–30 min  Last verified: 8 July 2022 📖 ~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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Common Problems 114451

NetworkManager DNS Not Updating After Interface Change

🟡 Medium   ⏱ 5–30 min  Last verified: 8 July 2022 📖 ~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 Harden Shared Memory on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Harden Shared Memory on Debian 11

Introduction Debian 11 Bullseye is built around the ethos of stability and free software. Setting up harden shared memory on debian 11 on Bullseye leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Bullseye freeze. Follow each step carefully and the […]

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How to Configure IIS SSL/TLS on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure IIS SSL/TLS on Windows Server 2019

Introduction to IIS SSL/TLS Configuration on Windows Server 2019 Internet Information Services (IIS) 10 on Windows Server 2019 supports TLS 1.0 through TLS 1.3, with TLS 1.3 enabled by default when running on Windows Server 2019 version 1903 or later. Configuring SSL/TLS correctly on IIS means obtaining and binding a valid certificate, disabling outdated protocol […]

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