Troubleshooting

Common Problems 114923

RHEL 8 firewalld zone mismatch blocks application traffic

🟡 Medium   ⏱ 5–30 min  Last verified: 9 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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Common Problems 113037

Windows Server 2016 — Cumulative update fails because required Servicing Stack Update is missing — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 9 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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Common Problems 112446

Windows Server 2019 — SQL Browser service port 1434 conflict blocks instance lookup — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 9 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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openSUSE Tumbleweed — libressl — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — libressl — multiple vulnerabilities (6 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory Related CVEs: CVE-2014-3502 CVE-2014-8176 CVE-2015-5333 CVE-2015-5334 CVE-2018-12434 CVE-2018-8970 Upstream summary: Apache Cordova Android before 3.5.1 allows remote attackers to open and send data to arbitrary applications via a URL with a […]

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How to Set Up HAProxy Load Balancer on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Set Up HAProxy Load Balancer on Debian 10

Introduction Debian 10 Buster is built around the ethos of stability and free software. Setting up set up haproxy load balancer on debian 10 on Buster leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Buster freeze. Follow each step carefully […]

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Debian 10 — pacemaker — vulnerability — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — pacemaker — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 9 March 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-25654 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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Ubuntu 16.04 — neutron — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — neutron — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 9 March 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4036-1 Related CVEs: CVE-2019-9735 Upstream summary: Erik Olof Gunnar Andersson discovered that OpenStack Neutron incorrectly handled certain security group rules in the iptables firewall module. An authenticated attacker could possibly […]

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openSUSE Tumbleweed — vino — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — vino — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory SUSE-SR:2011:009 (see also SUSE bugzilla) Related CVEs: CVE-2011-0904 CVE-2011-1164 CVE-2019-15681 CVE-2011-0905 Upstream summary: The rfbSendFramebufferUpdate function in server/libvncserver/rfbserver.c in vino-server in Vino 2.x before 2.28.3, 2.32.x before 2.32.2, 3.0.x before 3.0.2, and […]

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Debian 9 — tomcat8 — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Debian 9

Debian 9 — tomcat8 — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 9 March 2020 Affected versions: Debian 9 (stretch) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2017-5664 CVE-2017-7674 CVE-2018-8014 CVE-2018-1304 CVE-2019-17569 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative […]

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Common Problems 121120

Debian 10 – unattended-upgrades Leaves Pending Reboot Drift – Controlled Patch Flow

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