DNS

Common Problems 116081

Ubuntu 26.04 LTS – UFW blocks expected application traffic – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 11 June 2026 Affected versions: Ubuntu 26.04 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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How to Run OpenSCAP Compliance Scans on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Run OpenSCAP Compliance Scans on RHEL 10

Introduction This tutorial demonstrates how to Run OpenSCAP Compliance Scans on RHEL 10 on RHEL 10. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered RHEL 10 system with the default AppStream repositories […]

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Common Problems 115933

Fix Netplan Static IP Misconfiguration on Ubuntu 26.04 LTS

🟠 High   ⏱ 5–30 min  Last verified: 10 June 2026 Affected versions: 26.04 📖 ~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 […]

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How to Configure Network Bonding and Teaming on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure Network Bonding and Teaming on RHEL 9

NIC bonding combines multiple physical network interfaces into a single logical interface, providing link redundancy, increased throughput, or both — depending on the bonding mode selected. On RHEL 9, NetworkManager is the canonical tool for managing bonded interfaces, replacing the older ifcfg scripts. This tutorial covers creating a bond with nmcli, adding slave interfaces, assigning […]

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Common Problems 114107

RHEL 10 – systemd-resolved causes intermittent DNS failures with split-DNS VPN – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 10 June 2026 Affected versions: RHEL 10 📖 ~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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FreeBSD 14 — dnsmasq — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 14

FreeBSD 14 — dnsmasq — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 10 June 2026 Affected versions: FreeBSD 14 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: dnsmasq — multiple vulnerabilities Related CVEs: CVE-2009-2957 CVE-2009-2958 CVE-2015-3294 CVE-2015-8899 CVE-2017-13704 CVE-2017-14491 CVE-2017-14492 CVE-2017-14493  +12 more Upstream summary: Simon Kelley reports: Today, 11th May 2026 CERT is releasing a set […]

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Common Problems 116125

Ubuntu 26.04 LTS – systemd service enters restart loop from bad ExecStart – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 10 June 2026 Affected versions: Ubuntu 26.04 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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How to Configure ModSecurity WAF with Apache2 on FreeBSD 15 — step-by-step FreeBSD 15 tutorial on Progressive Robot

How to Configure ModSecurity WAF with Apache2 on FreeBSD 15

Introduction Deploying configure modsecurity waf with apache2 on a FreeBSD 15 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard base + […]

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Common Problems 115939

Ubuntu 26.04 LTS – cloud-init overwrites custom netplan configuration on reboot

🟡 Medium   ⏱ 5–30 min  Last verified: 9 June 2026 Affected versions: Ubuntu 26.04 LTS Ubuntu 26.04 Ubuntu 26.04.1 📖 ~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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Common Problems 116009

Ubuntu 26.04 LTS – NVIDIA driver update results in black screen after login

🟠 High   ⏱ 5–30 min  Last verified: 9 June 2026 Affected versions: Ubuntu 26.04 LTS Ubuntu 26.04 Ubuntu 26.04.1 📖 ~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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