DNS

Common Problems 119052

Ubuntu 14.04 LTS TLS chain misconfiguration triggers certificate warnings

🟡 Medium   ⏱ 5–30 min  Last verified: 25 September 2022 Affected versions: 14.04 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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Common Problems 114905

Subscription Channels Missing in RHEL 8

🟡 Medium   ⏱ 5–30 min  Last verified: 25 September 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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How To Setup DNSSEC on an Authoritative BIND DNS Server — step-by-step Security tutorial on Progressive Robot

How To Setup DNSSEC on an Authoritative BIND DNS Server

We all know that DNS is a protocol which resolves domain names to IP addresses, but how do we know the authenticity of the returned IP address? It is possible for an attacker to tamper a DNS response or poison the DNS cache and take users to a malicious site with the legitimate domain name in the address bar.

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How to Configure rkhunter Rootkit Scanner on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Configure rkhunter Rootkit Scanner on Debian 11

Introduction How to Configure rkhunter Rootkit Scanner on Debian 11 is a fundamental operation for any administrator maintaining a Debian 11 Bullseye server. Debian 11 Bullseye ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 11. […]

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Common Problems 117054

Ubuntu 22.04 LTS Wi-Fi Adapter Missing Firmware

🟡 Medium   ⏱ 5–30 min  Last verified: 24 September 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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How to Install and Configure k3s Lightweight Kubernetes on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Install and Configure k3s Lightweight Kubernetes on Debian 11

Introduction This guide explains how to Install and Configure k3s Lightweight Kubernetes on Debian 11 on Debian 11 Bullseye. Debian Bullseye 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 11 install […]

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How to Monitor Kubernetes with Prometheus and Grafana on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Monitor Kubernetes with Prometheus and Grafana on RHEL 8

Prometheus and Grafana are the de facto standard observability stack for Kubernetes, providing metrics collection, long-term storage, alerting, and rich dashboarding in a single integrated solution. The kube-prometheus-stack Helm chart bundles Prometheus, Grafana, Alertmanager, and a comprehensive set of pre-built Kubernetes dashboards and alert rules into a single deployment that takes minutes to install. This […]

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Common Problems 120675

Debian 11 TLS Handshake Failures to Repository or API Endpoints

🟠 High   ⏱ 5–30 min  Last verified: 23 September 2022 Affected versions: Debian 11 📖 ~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 116928

Ubuntu 22.04 LTS – apt update reports release file changed – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 23 September 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 113511

Windows Server 2012 R2 — SNMP service stops responding to queries — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 23 September 2022 Affected versions: Windows Server 2012 R2 📖 ~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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