January 2020 - Page 14 of 69

How to Install and Configure Nagios Core on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Install and Configure Nagios Core on RHEL 9

Nagios Core is a widely-used open-source infrastructure monitoring system that alerts administrators to host and service failures. On RHEL 9, Nagios Core must be compiled from source since no official RPM package is maintained for the current release. This guide walks you through building Nagios Core 4.x, installing the standard plugins, securing the web interface […]

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openSUSE Tumbleweed — rubygem-passenger — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — rubygem-passenger — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2018-12026 CVE-2014-1831 CVE-2014-1832 CVE-2015-7519 CVE-2016-1247 CVE-2018-12029 CVE-2013-2119 Upstream summary: During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion Passenger 5.3.x before 5.3.2 allows […]

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Common Problems 114474

SELinux Denies Web Service Access on RHEL 9

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 📖 ~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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Common Problems 114038

RHEL 10 Kernel Update Leaves Required Driver Module Missing

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: RHEL 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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How to Configure Postfix Mail Server on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure Postfix Mail Server on Debian 10

Introduction Deploying configure postfix mail server on debian 10 on a Debian 10 Buster 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 You will […]

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Common Problems 113608

Windows Server 2012 R2 — WindowsUpdate.log conversion fails because ETW decoder cannot find symbols — Fix & Prevention

🟢 Low   ⏱ 5–30 min  Last verified: 05 June 2027 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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FreeBSD 12 — openssl-beta — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — openssl-beta — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: openssl — potential SSL 2.0 rollback Related CVEs: CVE-2004-0079 CVE-2005-2969 Upstream summary: Vulnerability: Such applications are affected if they use the option SSL_OP_MSIE_SSLV2_RSA_PADDING. This option is implied by use of […]

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