Security Hardening

Common Problems 113433

Windows Server 2012 R2 — Boot fails with CRITICAL_SERVICE_FAILED blue screen — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 29 August 2020 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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How to Use filemon for I/O Monitoring on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Use filemon for I/O Monitoring 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 use filemon for i/o monitoring on ibm aix 7.1 […]

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Alpine Linux edge — pure-ftpd — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — pure-ftpd — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 1.0.49-r1 📖 ~4 min read  •  Source: Alpine secdb entry — pure-ftpd 1.0.49-r1 Related CVEs: CVE-2020-9274 CVE-2020-9365 Upstream summary: Alpine community repository for vedge ships pure-ftpd 1.0.49-r1 which addresses CVE-2020-9274. Table of contents Symptom & Impact […]

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Debian 10 — gst-plugins-ugly1.0 — vulnerability — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — gst-plugins-ugly1.0 — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 29 August 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker 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 […]

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Arch Linux — atftp — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — atftp — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202101-24 Related CVEs: CVE-2020-6097 Upstream summary: Type: denial of service. Status: Fixed. Affected: 0.7.2-2. Fixed in: 0.7.2-3. Group: AVG-1395. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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How to Configure Mandatory Access Control with SELinux Policies on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure Mandatory Access Control with SELinux Policies on RHEL 8

SELinux Mandatory Access Control (MAC) confines processes to only the resources they legitimately need, limiting the damage an attacker can do even after exploiting a vulnerability. While RHEL 8 ships with broad pre-built policies for common services, custom applications often generate AVC (Access Vector Cache) denial messages because no policy exists for them yet. Rather […]

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Common Problems 121192

Debian 10 – Fail2ban blocks internal monitoring and trusted hosts

🟡 Medium   ⏱ 5–30 min  Last verified: 28 August 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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Common Problems 115544

journalctl Disk Usage Grows Unexpectedly

🟡 Medium   ⏱ 5–30 min  Last verified: 28 August 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 113116

Windows Server 2016 PerfMon Shows High Split IO per Sec on Misaligned Virtual Disks – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 28 August 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 112498

Windows Server 2019 — Dual Scan Configuration Pulls Unapproved Internet Updates — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 28 August 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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