Networking

How to Install Zabbix Agent on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Install Zabbix Agent on Windows Server 2019

Introduction to Zabbix Agent on Windows Server 2019 Zabbix is a mature, open-source enterprise monitoring platform that supports agentless and agent-based monitoring for servers, network devices, applications, and cloud services. Installing the Zabbix Agent on Windows Server 2019 enables the Zabbix Server to collect system performance metrics, monitor services, execute remote commands, and trigger alerts […]

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Common Problems 117426

Ubuntu 20.04 LTS – DNS resolution fails with systemd-resolved stub issues – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 17 November 2020 Affected versions: Ubuntu 20.04 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 Manage Packages with DNF on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Manage Packages with DNF on Oracle Linux 8

Introduction How to Manage Packages with DNF on Oracle Linux 8 on Oracle Linux 8 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration […]

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How to Set Up ModSecurity WAF with Apache on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Set Up ModSecurity WAF with Apache on FreeBSD 12

Introduction How to Set Up ModSecurity WAF with Apache on FreeBSD 12 is a core administration task for any FreeBSD 12 server operator. FreeBSD 12 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf […]

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How to Configure Btrfs Snapshots on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure Btrfs Snapshots on Oracle Linux 8

Introduction Oracle Linux 8 ships with a stable, security-hardened base that makes deploying configure btrfs snapshots on oracle linux 8 both straightforward and auditable. This tutorial covers the complete procedure for how to Configure Btrfs Snapshots on Oracle Linux 8, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for […]

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How to Configure the System Timezone on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure the System Timezone on Debian 9

Introduction Deploying configure the system timezone on debian 9 on a Debian 9 Stretch 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 will […]

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Common Problems 117430

Ubuntu 20.04 LTS DHCP Lease Not Renewing

🟡 Medium   ⏱ 5–30 min  Last verified: 15 November 2020 📖 ~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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Common Problems 113633

Windows Server 2012 R2 — TLS handshake to internal services fails after cipher policy changes — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 15 November 2020 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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How to Set Up ClamAV Antivirus on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Set Up ClamAV Antivirus on Oracle Linux 8

Introduction Setting up set up clamav antivirus on oracle linux 8 on a Oracle Linux 8 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Set Up ClamAV Antivirus on Oracle Linux 8, with all the commands you need, the SELinux and firewalld considerations to […]

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How to Configure System Center Data Protection Manager Agent on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure System Center Data Protection Manager Agent on Windows Server 2012 R2

How to Configure System Center Data Protection Manager Agent on Windows Server 2012 R2 System Center Data Protection Manager (DPM) is Microsoft’s enterprise backup and recovery solution that provides continuous data protection for Windows servers, Hyper-V VMs, SQL Server, Exchange, SharePoint, and file servers. The DPM protection agent installed on each protected server enables near-real-time […]

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