Security Hardening

Common Problems 115521

Kernel Updated but Host Booting Old Kernel on RHEL 7

🟡 Medium   ⏱ 5–30 min  Last verified: 12 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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How to Configure Bootlist on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Configure Bootlist 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 bootlist on ibm aix 7.1 on IBM AIX […]

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How to Monitor Server Health with Server Manager on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Monitor Server Health with Server Manager on Windows Server 2012 R2

How to Configure PowerShell Execution Policies on Windows Server 2012 R2 PowerShell execution policies control which scripts are allowed to run on a Windows system. On Windows Server 2012 R2, the default execution policy for Server Core installations is RemoteSigned, which permits locally written scripts and requires digital signatures only for scripts downloaded from the […]

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How to Install Portainer on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install Portainer on Debian 9

Introduction Deploying install portainer 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 Ensure Debian 9 Stretch […]

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Gentoo Linux — dev-util/re2c — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — dev-util/re2c — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202408-16 Related CVEs: CVE-2018-21232 CVE-2020-11958 Upstream summary: Please review the CVE identifier referenced below for details. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis […]

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How to Configure Bacula Backup Server on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure Bacula Backup Server on Debian 10

Introduction How to Configure Bacula Backup Server on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 10. […]

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openSUSE Tumbleweed — libetpan20 — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — libetpan20 — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory openSUSE-SU-2020:1454-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-15953 CVE-2017-8825 Upstream summary: LibEtPan through 1.9.4, as used in MailCore 2 through 0.6.3 and other products, has a STARTTLS buffering issue that affects IMAP, […]

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Oracle Linux 8 — freetype — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — freetype — vulnerability — patch and remediation guide (ELSA-2020-4952)

🟠 High   ⏱ 15–60 min  Last verified: 12 August 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-4952 Related CVEs: CVE-2020-15999 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 121164

Debian 10: rsync over SSH fails after host key rotation

🟡 Medium   ⏱ 5–30 min  Last verified: 11 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 121021

GRUB Boot Error After Kernel Changes

🔴 Critical   ⏱ 5–30 min  Last verified: 11 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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