Troubleshooting

How to Set Up System Center Configuration Manager on Windows Server 2016

• July 17, 2020
• Tutorials
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How to Configure Windows Server 2016 Configuration Manager System Center Configuration Manager (SCCM), also known as ConfigMgr or now Microsoft Endpoint Configuration Manager, is the enterprise-grade solution for managing large fleets of Windows servers and workstations. SCCM handles operating system deployment, software distribution, patch management, hardware and software inventory, compliance settings, and endpoint protection from […]

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Debian 9 interrupted dpkg Requires Manual Configuration

• July 16, 2020
• Linux
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🟠 High   ⏱ 5–30 min  Last verified: 16 July 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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firewalld Zone-Interface Mismatch Causing Intermittent Access

• July 16, 2020
• Tutorials
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🟡 Medium   ⏱ 5–30 min  Last verified: 16 July 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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RHEL 8 nftables and firewalld Rules Conflict After Manual Changes

• July 16, 2020
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 16 July 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 Configure GPG Key Management on Debian 9

• July 16, 2020
• Linux
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Introduction Deploying configure gpg key management on debian 9 on a Debian 9 Stretch 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 Before you […]

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Ubuntu 20.04 — blueman — multiple vulnerabilities (2 CVEs) — patch and remediation guide

• July 16, 2020
• Linux
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🟢 Low   ⏱ 5–15 min  Last verified: 16 July 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4605-2 Related CVEs: https://launchpad.net/bugs/1897287 CVE-2020-15238 Upstream summary: Vaisha Bernard discovered that blueman did not properly sanitize input on the d-bus interface to blueman-mechanism. A local attacker could possibly use this […]

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How to Configure Alertmanager on Debian 10

• July 16, 2020
• Linux
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Introduction Deploying configure alertmanager 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 Ensure Debian 10 Buster […]

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How to Set Up Active Directory Password Policy on Windows Server 2019

• July 16, 2020
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Introduction to Active Directory Password Policy Enforcing a strong password policy is one of the most fundamental security controls in any Active Directory environment. Windows Server 2019 provides a Default Domain Password Policy applied through Group Policy, which governs all accounts in the domain unless overridden by Fine-Grained Password Policies. This tutorial walks through configuring […]

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Ubuntu 18.04 LTS – SSH key authentication fails due to permission errors – Fix & Prevention

• July 15, 2020
• Linux
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🟠 High   ⏱ 5–30 min  Last verified: 15 July 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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chronyd Not Syncing Time on RHEL 7

• July 15, 2020
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🟡 Medium   ⏱ 5–30 min  Last verified: 15 July 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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