Troubleshooting

Common Problems 113030

Windows Server 2016 — DHCP client fails to obtain lease on startup — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 29 March 2020 Affected versions: Windows Server 2016 📖 ~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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Oracle Linux 8 — pcre — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — pcre — vulnerability — patch and remediation guide (ELSA-2021-4373)

🟢 Low   ⏱ 5–15 min  Last verified: 29 March 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-4373 Related CVEs: CVE-2020-14155 CVE-2019-20838 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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How to Configure HAProxy for HTTP and TCP Load Balancing on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure HAProxy for HTTP and TCP Load Balancing on RHEL 7

How to Configure HAProxy for HTTP and TCP Load Balancing on RHEL 7 HAProxy is one of the most widely deployed open-source load balancers in production infrastructure, renowned for its high throughput, low latency, and fine-grained configurability. On RHEL 7 it is available directly from the base repositories and integrates cleanly with systemctl and firewalld. […]

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

Oracle Linux 8 — GraalVM — vulnerability — patch and remediation guide (ELSA-2023-12675)

🟠 High   ⏱ 15–60 min  Last verified: 29 March 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-12675 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 […]

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Common Problems 121488

SSH Access Denied After Security Hardening Changes

🔴 Critical   ⏱ 5–30 min  Last verified: 28 March 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 115528

RHEL 7 service mariadb Starts then Immediately Stops

🟡 Medium   ⏱ 5–30 min  Last verified: 28 March 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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How to Install PostgreSQL on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install PostgreSQL on Debian 9

Introduction This guide explains how to Install PostgreSQL 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 install with the standard repositories […]

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openSUSE Tumbleweed — libical3 — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — libical3 — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2017:1989-1 (see also SUSE bugzilla) Related CVEs: CVE-2016-5827 CVE-2016-9584 Upstream summary: The icaltime_from_string function in libical 0.47 and 1.0 allows remote attackers to cause a denial of service (out-of-bounds heap read) via […]

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Common Problems 112436

Windows Server 2019 — SQL Server service won’t start after disk path change — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 28 March 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 — dbus-glib — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — dbus-glib — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 28 March 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: dbus-glib — privledge escalation Related CVEs: CVE-2013-0292 Upstream summary: Sebastian Krahmer reports: A privilege escalation flaw was found in the way dbus-glib, the D-Bus add-on library to integrate the standard […]

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