Troubleshooting

Common Problems 118416

Ubuntu 16.04 LTS – apt update shows NO_PUBKEY signature failures

🟠 High   ⏱ 5–30 min  Last verified: 13 January 2021 Affected versions: Ubuntu 16.04 LTS Ubuntu 16.04 Ubuntu 16.04.7 📖 ~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 […]

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Ubuntu 20.04 — libpodofo — multiple vulnerabilities (10 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — libpodofo — multiple vulnerabilities (10 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 13 January 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7217-1 Related CVEs: CVE-2017-5886 CVE-2018-11255 CVE-2018-12983 CVE-2018-20797 CVE-2018-5308 CVE-2018-8002 CVE-2019-10723 CVE-2020-18971  +2 more Upstream summary: It was discovered that the PoDoFo library could dereference a NULL pointer when getting the […]

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How to Install Ruby on Rails on SLES 12 — step-by-step SUSE Linux Enterprise 12 tutorial on Progressive Robot

How to Install Ruby on Rails on SLES 12

Introduction This tutorial covers How to Install Ruby on Rails on SLES 12 on SLES 12. SLES 12 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Prerequisites Ensure your SLES 12 system is up to date: zypper […]

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Common Problems 112914

Windows Server 2016 — Password change rejected with policy mismatch even though it meets stated requirements — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 13 January 2021 Affected versions: Windows Server 2016 📖 ~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 Use AIX Security Compliance Assessment on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Use AIX Security Compliance Assessment on IBM AIX 7.2

Introduction IBM AIX 7.2 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 7.2 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to use aix security compliance assessment on ibm aix 7.2 […]

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How to Set Up Hyper-V Integration Services on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Set Up Hyper-V Integration Services on Windows Server 2012 R2

How to Set Up Hyper-V Integration Services on Windows Server 2012 R2 Hyper-V Integration Services (IS) are a suite of drivers and services that run inside the virtual machine guest OS to enable communication between the VM and the Hyper-V host. Without Integration Services, a VM is isolated from the host — it cannot receive […]

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How to Install Docker Engine on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install Docker Engine on Oracle Linux 8

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

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Oracle Linux 8 — perl-Convert-ASN1 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — perl-Convert-ASN1 — vulnerability — patch and remediation guide (ELSA-2024-3049)

🟡 Medium   ⏱ 10–30 min  Last verified: 13 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2024-3049 Related CVEs: CVE-2013-7488 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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How to Install and Configure IIS on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Install and Configure IIS on Windows Server 2016

How to Configure Windows Server 2016 IIS Web Server Internet Information Services (IIS) 10.0 is the web server platform included with Windows Server 2016. It supports HTTP, HTTPS, FTP, and WebSockets, and is used to host websites, web applications, REST APIs, and web services. This guide covers installing IIS, creating websites, configuring bindings and SSL […]

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Oracle Linux 8 — httpd:2.4 security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — httpd:2.4 security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2021-1809)

🟡 Medium   ⏱ 10–30 min  Last verified: 12 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-1809 Related CVEs: CVE-2020-11993 CVE-2018-17199 CVE-2020-11984 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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