Logging Monitoring

Common Problems 112401

Windows Server 2019 – Hyper-V Replica enters critical state after network interruption – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 6 September 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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FreeBSD 12 — p11-kit — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — p11-kit — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 6 September 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: p11-kit — Multiple vulnerabilities Related CVEs: CVE-2020-29361 CVE-2020-29362 CVE-2020-29363 Upstream summary: The p11-glue project reports: CVE-2020-29363: Out-of-bounds write in p11_rpc_buffer_get_byte_array_value function A heap-based buffer overflow has been discovered in the […]

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Ubuntu 16.04 — ldns — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — ldns — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 6 September 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5257-1 Related CVEs: CVE-2020-19860 CVE-2020-19861 CVE-2014-3209 CVE-2017-1000231 CVE-2017-1000232 Upstream summary: It was discovered that ldns incorrectly handled certain inputs. An attacker could possibly use this issue to expose sensitive information. […]

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How to Set Up Cron Jobs and Scheduled Tasks on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Set Up Cron Jobs and Scheduled Tasks on Debian 9

Introduction This guide explains how to Set Up Cron Jobs and Scheduled Tasks on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 […]

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

Oracle Linux 8 — libtiff — vulnerability — patch and remediation guide (ELSA-2020-1688)

🟡 Medium   ⏱ 10–30 min  Last verified: 6 September 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-1688 Related CVEs: CVE-2019-14973 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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Gentoo Linux — net-libs/glib-networking — vulnerability — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — net-libs/glib-networking — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202007-50 Related CVEs: CVE-2020-13645 Upstream summary: GTlsClientConnection skips hostname verification of the server’s TLS certificate if the application fails to specify the expected server identity. Table of contents Symptom & Impact Environment […]

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How to Set Up Bash Aliases and Environment Variables on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Set Up Bash Aliases and Environment Variables on Debian 10

Introduction How to Set Up Bash Aliases and Environment Variables 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 […]

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Common Problems 121631

Debian 9 – DKMS Module Build Fails After Kernel Update – Header Alignment

🟠 High   ⏱ 5–30 min  Last verified: 5 September 2020 Affected versions: Debian 9 📖 ~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 121134

Debian 10: Fail2ban blocks internal monitoring IPs

🟡 Medium   ⏱ 5–30 min  Last verified: 5 September 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 115105

RHEL 8 httpd Returns 503 Due to php-fpm Socket Permissions

🟡 Medium   ⏱ 5–30 min  Last verified: 5 September 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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