Troubleshooting

Common Problems 117420

Ubuntu 20.04 LTS UFW Rules Not Persisting as Expected

🟡 Medium   ⏱ 5–30 min  Last verified: 5 May 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 PostgreSQL Remote Access on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure PostgreSQL Remote Access on Debian 10

Introduction This guide explains how to Configure PostgreSQL Remote Access on Debian 10 on Debian 10 Buster. Debian Buster 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 10 install with the […]

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Common Problems 113127

Windows Server 2016 — MSU install fails with architecture mismatch on Server Core host — Fix & Prevention

🟢 Low   ⏱ 5–30 min  Last verified: 5 May 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 112599

Windows Server 2019 — Time synchronization drift causes Kerberos authentication failures — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 5 May 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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Alpine Linux edge — pcre — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — pcre — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 8.44-r0 📖 ~4 min read  •  Source: Alpine secdb entry — pcre 8.44-r0 Related CVEs: CVE-2020-14155 CVE-2017-7186 CVE-2017-11164 CVE-2017-16231 Upstream summary: Alpine main repository for vedge ships pcre 8.44-r0 which addresses CVE-2020-14155. Table of contents Symptom […]

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FreeBSD 12 — a2ps-letter — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — a2ps-letter — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 5 May 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: a2ps — insecure temporary file creation Related CVEs: CVE-2004-1170 CVE-2004-1377 Upstream summary: A Secunia Security Advisory reports that Javier Fernández-Sanguino Peña has found temporary file creation vulnerabilities in the fixps […]

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How to Monitor Windows Server 2016 with SolarWinds — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Monitor Windows Server 2016 with SolarWinds

How to Set Up SolarWinds Monitoring Agent on Windows Server 2016 SolarWinds offers a suite of monitoring products, and its agent-based monitoring approach is central to platforms such as SolarWinds Server and Application Monitor (SAM) and the N-able N-central and N-sight Remote Monitoring and Management products. Installing the SolarWinds agent on a Windows Server 2016 […]

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Ubuntu 20.04 — ansible — multiple vulnerabilities (14 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — ansible — multiple vulnerabilities (14 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 5 May 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7330-1 Related CVEs: CVE-2015-3908 CVE-2015-6240 CVE-2016-8614 CVE-2019-10206 CVE-2019-14846 CVE-2019-14904 CVE-2020-10729 CVE-2020-1739  +6 more Upstream summary: It was discovered that Ansible did not properly verify certain fields of X.509 certificates. An […]

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