Security Hardening

SLES 12 — java — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — java — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 20 January 2021 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2020:0001-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-17631 CVE-2020-27221 CVE-2012-0497 CVE-2012-1533 CVE-2012-1682 CVE-2012-1713 CVE-2012-1716 CVE-2012-1723  +12 more Upstream summary: From Eclipse OpenJ9 0.15 to 0.16, access to diagnostic operations such as causing […]

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Arch Linux — libslirp — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — libslirp — multiple vulnerabilities (6 CVEs) — 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-202106-49 Related CVEs: CVE-2021-3595 CVE-2021-3594 CVE-2021-3593 CVE-2021-3592 CVE-2020-29130 CVE-2020-29129 Upstream summary: Type: information disclosure. Status: Fixed. Affected: 4.5.0-1. Fixed in: 4.6.0-1. Group: AVG-2073. Table of contents Symptom & Impact Environment […]

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Common Problems 119058

Ubuntu 14.04 LTS Apache2 Fails with Address Already in Use

🟡 Medium   ⏱ 5–30 min  Last verified: 19 January 2021 📖 ~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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Oracle Linux 8 — Bug fix of NetworkManager — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — Bug fix of NetworkManager (ELSA-2025-0288)

🟡 Medium   ⏱ 10–30 min  Last verified: 19 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2025-0288 Related CVEs: CVE-2024-3661 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Common Problems 118495

UFW Blocks SSH or Application Ports Unexpectedly

🟡 Medium   ⏱ 5–30 min  Last verified: 19 January 2021 📖 ~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 115446

RHEL 7 service network Restart Drops Active SSH Sessions

🟠 High   ⏱ 5–30 min  Last verified: 19 January 2021 Affected versions: RHEL 7 📖 ~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 115409

RHEL 7 service reports running but application port is not listening

🟠 High   ⏱ 5–30 min  Last verified: 19 January 2021 Affected versions: RHEL 7 📖 ~2 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 Install Elasticsearch on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install Elasticsearch on Oracle Linux 8

Introduction This tutorial demonstrates how to Install Elasticsearch on Oracle Linux 8 on Oracle Linux 8. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered Oracle Linux 8 system with the default AppStream […]

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How to Configure IBM PowerHA SystemMirror on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Configure IBM PowerHA SystemMirror 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 ibm powerha systemmirror on ibm aix 7.1 on […]

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

Alpine Linux edge — squashfs-tools — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 4.5-r1 📖 ~4 min read  •  Source: Alpine secdb entry — squashfs-tools 4.5-r1 Related CVEs: CVE-2021-41072 CVE-2021-40153 Upstream summary: Alpine main repository for vedge ships squashfs-tools 4.5-r1 which addresses CVE-2021-41072. Table of contents Symptom & Impact […]

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