Networking

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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How to Set the Hostname on FreeBSD 15 — step-by-step FreeBSD 15 tutorial on Progressive Robot

How to Set the Hostname on FreeBSD 15

Introduction Deploying set the hostname 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 + ports approach […]

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How to Configure PHP-FPM with Nginx on Ubuntu 26.04 — step-by-step Linux tutorial on Progressive Robot

How to Install and Configure Laravel 12 with Nginx on Ubuntu 26.04

Laravel 12 is the latest major release of the popular PHP framework, featuring a streamlined directory structure, improved performance, and modern PHP 8.4 syntax support. This guide installs Laravel 12 on a LEMP stack (Linux, Nginx, MySQL, PHP 8.4) on Ubuntu 26.04 LTS. Tested and valid on: Ubuntu 26.04 LTS Prerequisites Ubuntu 26.04 LTS with […]

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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 Alertmanager on FreeBSD 15 — step-by-step FreeBSD 15 tutorial on Progressive Robot

How to Configure Alertmanager on FreeBSD 15

Introduction FreeBSD 15 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up configure alertmanager on FreeBSD 15 follows the rc.conf/service(8) paradigm rather than systemd, which means enabling a service and configuring its startup options are done differently from any Linux distribution. This guide walks through […]

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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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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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