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How to Install CodeIgniter on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Install CodeIgniter on CentOS Stream 9

Introduction This tutorial demonstrates how to Install CodeIgniter on CentOS Stream 9 on CentOS Stream 9. 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 CentOS Stream 9 system with the default AppStream […]

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Common Problems 118921

Ubuntu 14.04 LTS apt/dpkg lock prevents updates

🟡 Medium   ⏱ 5–30 min  Last verified: 15 January 2022 Affected versions: 14.04 LTS 📖 ~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 114970

Slow SSH login caused by reverse DNS lookup

🟡 Medium   ⏱ 5–30 min  Last verified: 15 January 2022 📖 ~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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FreeBSD 13 — py311-pymatgen — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — py311-pymatgen — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 15 January 2022 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: py-pymatgen — regular expression denial of service Related CVEs: CVE-2022-42964 Upstream summary: An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the pymatgen PyPI package, when an […]

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How to Configure Nginx Rate Limiting on SLES 12 — step-by-step SUSE Linux Enterprise 12 tutorial on Progressive Robot

How to Configure Nginx Rate Limiting on SLES 12

Introduction This tutorial covers How to Configure Nginx Rate Limiting 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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AlmaLinux 8 — po4a — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — po4a — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALEA-2021:4520 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Debian 11 — php-league-flysystem — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — php-league-flysystem — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 15 January 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2021-32708 Upstream summary: Flysystem is an open source file storage library for PHP. The whitespace normalisation using in 1.x and 2.x removes any unicode whitespace. Under certain specific […]

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Common Problems 113500

Windows Server 2012 R2 — UPN suffix routing fails for users in trusted forest — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 15 January 2022 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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Debian 11 — arpwatch — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — arpwatch — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 15 January 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2012-2653 Upstream summary: arpwatch 2.1a15, as used by Red Hat, Debian, Fedora, and possibly others, does not properly drop supplementary groups, which might allow attackers to gain root […]

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