October 2020 - Page 6 of 69

Common Problems 114015

RHEL 10 – firewalld zone assignment resets when interface name changes

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: RHEL 10 RHEL 10.0 RHEL 10.1 📖 ~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 & […]

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Ubuntu 18.04 — kamailio — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — kamailio — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7416-1 Related CVEs: CVE-2016-2385 CVE-2018-14767 CVE-2020-28361 CVE-2018-16657 CVE-2020-27507 Upstream summary: Stelios Tsampas discovered that Kamailio did not correctly handle certain memory operations, which could lead to a buffer overflow. A […]

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Common Problems 113077

Windows Server 2016 — Dual-scan behaviour causes clients to bypass WSUS for feature updates — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 04 June 2027 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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Ubuntu 20.04 — ruby-websocket-extensions — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — ruby-websocket-extensions — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4502-1 Related CVEs: CVE-2020-7663 Upstream summary: It was discovered that websocket-extensions does not properly parse special headers. A remote attacker could use this issue to cause regex backtracking, resulting in […]

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How to Configure HACMP/PowerHA for High Availability on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Configure HACMP/PowerHA for High Availability on IBM AIX 7.2

Introduction IBM AIX 7.2 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.2 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to configure hacmp/powerha for high availability on ibm aix 7.2 […]

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Kubernetes Networking Under the Hood — step-by-step Kubernetes tutorial on Progressive Robot

Kubernetes Networking Under the Hood

Kubernetes is a powerful container orchestration system that can manage the deployment and operation of containerized applications across clusters of servers. In addition to coordinating container workloads, Kubernetes provides the infrastructure necessary to maintain reliable network connectivity between your containers. In this article we will discuss how Kubernetes satisfies these networking requirements within a cluster: how data moves inside a pod, between pods, and between nodes.

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How to Install Lua on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Install Lua on FreeBSD 12

Introduction This guide explains how to Install Lua on FreeBSD 12 on FreeBSD 12. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for fine-grained privilege separation. […]

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Debian 10 — unbound — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — unbound — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-16866 CVE-2020-12662 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 Work with Files using the fs Module in Node.js — step-by-step Javascript tutorial on Progressive Robot

How To Work with Files using the fs Module in Node.js

With Node.js, you can use JavaScript to programmatically manipulate files with the built-in fs module. The name is short for “file system,” and the module contains all the functions you need to read, write, and delete files on the local machine. In this article, you will use the asynchronous fs module to read a file with fs.readFile(), create and write to a new file with fs.writeFile(), delete the file with fs.unlink(), and move the first file with fs.rename().

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