Networking

Common Problems 118999

Ubuntu 14.04 LTS – SSH connection refused after security hardening

🟠 High   ⏱ 5–30 min  Last verified: 23 September 2019 Affected versions: Ubuntu 14.04 LTS Ubuntu 14.04 Ubuntu 14.04.6 📖 ~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 118438

Failed to start Network Manager on boot

🟡 Medium   ⏱ 5–30 min  Last verified: 23 September 2019 📖 ~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 Build Grafana Dashboards for FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Build Grafana Dashboards for FreeBSD 12

Introduction This guide explains how to Build Grafana Dashboards for 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 […]

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How to Configure Application Performance Monitoring on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure Application Performance Monitoring on Windows Server 2012 R2

How to Configure Application Performance Monitoring on Windows Server 2012 R2 Application Performance Monitoring (APM) on Windows Server 2012 R2 encompasses a set of tools and techniques that measure how well application workloads perform, identify bottlenecks, and alert on degradation. Unlike infrastructure monitoring which focuses on CPU, memory, and disk, APM targets application-specific metrics: response […]

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How to Set Up Windows Deployment Services (WDS) on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Set Up Windows Deployment Services (WDS) on Windows Server 2012 R2

How to Set Up Windows Deployment Services (WDS) on Windows Server 2012 R2 Windows Deployment Services (WDS) is a server role that enables network-based installation of Windows operating systems to bare-metal machines, virtual machines, and servers that support PXE (Preboot Execution Environment) boot. WDS eliminates the need for physical installation media by serving boot images […]

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How to Configure Windows Admin Center on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure Windows Admin Center on Windows Server 2016

Introduction Windows Admin Center (WAC) is a modern browser-based management console for Windows Server 2016. It replaces many legacy MMC snap-ins with a unified, extensible interface that supports role-based access and Azure hybrid services integration, making it the preferred management tool for modern Windows Server environments. Installing Windows Admin Center Install WAC on a dedicated […]

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How to Install MongoDB on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Install MongoDB on RHEL 8

MongoDB is a leading document-oriented NoSQL database that stores data in flexible JSON-like BSON documents, making it well-suited for applications with evolving schemas, hierarchical data, or high-throughput write workloads. MongoDB is not included in the RHEL 8 AppStream, so you must add the official MongoDB repository before installing. This guide walks through creating the MongoDB […]

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Common Problems 115429

RHEL 7 SELinux denial preventing httpd outbound connection

🟠 High   ⏱ 5–30 min  Last verified: 21 September 2019 Affected versions: RHEL 7 📖 ~2 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 Install .NET SDK and Runtime on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install .NET SDK and Runtime on RHEL 7

How to Install .NET SDK and Runtime on RHEL 7 The .NET platform from Microsoft is an open-source, cross-platform framework for building modern web applications, APIs, command-line tools, microservices, and more. Since .NET Core 3.x and the subsequent unified .NET 5+ releases, Linux has been a first-class deployment target — and Red Hat Enterprise Linux […]

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Common Problems 121513

Debian 9: Network outage from ifupdown and NetworkManager conflict

🟠 High   ⏱ 5–30 min  Last verified: 20 September 2019 Affected versions: Debian 9 📖 ~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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