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How to Configure DNSSEC on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure DNSSEC on Windows Server 2012 R2

How to Configure DNSSEC on Windows Server 2012 R2 DNSSEC (Domain Name System Security Extensions) is a suite of Internet Engineering Task Force (IETF) specifications for securing DNS data using cryptographic signatures. Without DNSSEC, DNS responses can be forged, allowing attackers to redirect users to malicious servers through cache poisoning attacks. DNSSEC adds digital signatures […]

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IBM AIX 7.3 — CVE-2021-29723 — vulnerability — patch and remediation guide — diagnosis and fix on IBM AIX 7.3

IBM AIX 7.3 — CVE-2021-29723 — vulnerability — patch and remediation guide

🟠 High   ⏱ 30–90 min  Last verified: 23 October 2022 Affected versions: IBM AIX 7.3 📖 ~4 min read  •  Source: NVD CVE-2021-29723, IBM Support Bulletin CVE: CVE-2021-29723 NVD summary: IBM Sterling Secure Proxy 6.0.1, 6.0.2, 2.4.3.2, and 3.4.3.2 uses weaker than expected cryptographic algorithms that could allow an attacker to decrypt highly sensitive […]

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Oracle Linux 9 — GraalVM — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — GraalVM — vulnerability — patch and remediation guide (ELSA-2023-12316)

🟠 High   ⏱ 15–60 min  Last verified: 23 October 2022 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-12316 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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How to Configure GitHub Actions Self-Hosted Runner on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Configure GitHub Actions Self-Hosted Runner on Debian 11

Introduction Deploying configure github actions self-hosted runner on debian 11 on a Debian 11 Bullseye 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 You […]

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How To Install Apache Kafka on Ubuntu 14.04 — step-by-step Linux tutorial on Progressive Robot

How To Install Apache Kafka on Ubuntu 14.04

Apache Kafka is a popular distributed message broker designed to handle large volumes of real-time data efficiently. A Kafka cluster is not only highly scalable and fault-tolerant, but it also has a much higher throughput compared to other message brokers such as ActiveMQ and RabbitMQ. Though it is generally used as a pub/sub messaging system, a lot of organizations also use it for log aggregation because it offers persistent storage for published messages.

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Common Problems 118512

Ubuntu 16.04 Kernel Panic on Boot After HWE Upgrade

🟡 Medium   ⏱ 5–30 min  Last verified: 22 October 2022 📖 ~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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Debian 11 — geomview — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — geomview — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 22 October 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2017-17530 Upstream summary: common/help.c in Geomview 1.9.5 does not validate strings before launching the program specified by the BROWSER environment variable, which might allow remote attackers to conduct […]

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Common Problems 116998

Ubuntu 22.04 LTS – SSH connection refused after reboot – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 22 October 2022 Affected versions: Ubuntu 22.04 LTS (Jammy) 📖 ~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 […]

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Common Problems 114569

Postfix Cannot Send Mail Due To DNS Or Relay Policy

🟡 Medium   ⏱ 5–30 min  Last verified: 22 October 2022 📖 ~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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