Security Hardening

Common Problems 112929

Windows Server 2016 – Cluster Shared Volume remains in redirected mode – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 26 October 2020 Affected versions: Windows Server 2016 📖 ~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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Common Problems 112638

Windows Server 2019 — Patch Compliance Drift Caused by Disabled UsoSvc and WaaSMedic — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 26 October 2020 Affected versions: Windows Server 2019 📖 ~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 Secure PostgreSQL on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Secure PostgreSQL on Oracle Linux 8

Introduction How to Secure PostgreSQL on Oracle Linux 8 on Oracle Linux 8 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 reproducible […]

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VMware ESXi 6.7 — ovf — multiple ESXi vulnerabilities (2 CVEs) — VIB / vLCM patch and remediation guide — diagnosis and fix on VMware ESXi 6.7

VMware ESXi 6.7 — ovf — multiple ESXi vulnerabilities (2 CVEs) — VIB / vLCM patch and remediation guide

🔴 Critical   ⏱ 30–120 min  Last verified: 25 May 2026 Affected versions: VMware ESXi 6.7 📖 ~4 min read  •  Source: VMware advisory VMSA-2020-0026 Related CVEs: CVE-2020-4004 CVE-2020-4005 Fixed image profile / build: ESXi670-202011301-SG Upstream summary: An issue in OVF descriptor parsing on ESXi (CVE-2020-4004 / CVE-2020-4005) lets a malicious actor with local access […]

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Ubuntu 16.04 — whoopsie — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — whoopsie — multiple vulnerabilities (6 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 26 October 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4450-1 Related CVEs: CVE-2020-11937 CVE-2020-12135 CVE-2020-15570 https://launchpad.net/bugs/1850608 CVE-2019-11484 CVE-2019-11476 Upstream summary: Seong-Joong Kim discovered that Whoopsie incorrectly handled memory. A local attacker could use this issue to cause Whoopsie to […]

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Oracle Linux 8 — openssl security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — openssl security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2019-3700)

🟢 Low   ⏱ 5–15 min  Last verified: 25 October 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2019-3700 Related CVEs: CVE-2018-0734 CVE-2018-0735 CVE-2019-1543 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification […]

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Common Problems 117397

Ubuntu 20.04 Stuck on Boot Splash After Updates

🟡 Medium   ⏱ 5–30 min  Last verified: 25 October 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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Common Problems 115022

RHEL 8 Subscription-Manager Shows Repositories Disabled Unexpectedly

🟠 High   ⏱ 5–30 min  Last verified: 25 October 2020 Affected versions: 8.4 8.5 8.6 8.7 8.8 8.9 8.10 📖 ~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 […]

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Common Problems 114930

Systemd service fails to start with unit errors

🟡 Medium   ⏱ 5–30 min  Last verified: 25 October 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 Packer on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install Packer on Oracle Linux 8

Introduction Oracle Linux 8 ships with a stable, security-hardened base that makes deploying install packer on oracle linux 8 both straightforward and auditable. This tutorial covers the complete procedure for how to Install Packer on Oracle Linux 8, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for network-facing services. […]

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