Security Hardening

Common Problems 121154

Debian 10: CIFS mount authentication fails with special-character credentials

🟡 Medium   ⏱ 5–30 min  Last verified: 8 May 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 118126

Ubuntu 18.04 LTS – rsyslog forwarding stops after remote TLS policy update – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 8 May 2020 Affected versions: Ubuntu 18.04 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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FreeBSD 12 — rubygem-json — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — rubygem-json — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 8 May 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: rubygem-json — Unsafe Objection Creation Vulnerability in JSON (Additional fix) Related CVEs: CVE-2020-10663 Upstream summary: When parsing certain JSON documents, the json gem (including the one bundled with Ruby) can […]

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Common Problems 117628

Ubuntu 20.04 LTS – certbot renewal fails because port 80 is in use

🟠 High   ⏱ 5–30 min  Last verified: 8 May 2020 Affected versions: Ubuntu 20.04 LTS Ubuntu 20.04 Ubuntu 20.04.6 📖 ~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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How to Install Memcached on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install Memcached on Debian 9

Introduction How to Install Memcached on Debian 9 is a fundamental operation for any administrator maintaining a Debian 9 Stretch server. Debian 9 Stretch 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 9. This tutorial […]

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Gentoo Linux — media-libs/libde265 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — media-libs/libde265 — multiple vulnerabilities (20 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-202408-20 Related CVEs: CVE-2020-21594 CVE-2020-21595 CVE-2020-21596 CVE-2020-21597 CVE-2020-21598 CVE-2020-21599 CVE-2020-21600 CVE-2020-21601  +12 more Upstream summary: Multiple vulnerabilities have been discovered in libde265. Please review the CVE identifiers referenced below for details. Table […]

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Common Problems 112452

Windows Server 2019 – Group Policy denied due to filtering or WMI scope errors – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 8 May 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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