Firewall

How to Install Docker on Windows Server 2025 — step-by-step Windows Server 2025 tutorial on Progressive Robot

How to Install Docker on Windows Server 2025

How to Install Docker on Windows Server 2025 Docker on Windows Server 2025 brings native container support directly to the host OS, enabling teams to run process-isolated Windows containers without a hypervisor layer between the application and the kernel. Unlike Docker Desktop on Windows 10/11, Docker Engine on Windows Server 2025 is a headless service […]

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How to Configure Unattended Upgrades on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

Initial Server Setup with Ubuntu 24.04 LTS

After spinning up a fresh Ubuntu 24.04 LTS server, a few essential steps harden the system, create a non-root administrative account, and prepare it for production workloads. This guide walks through every step from first login to a locked-down, up-to-date server. Tested and valid on: Ubuntu 24.04 LTS Prerequisites A fresh Ubuntu 24.04 LTS server […]

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Initial Configuration of Windows Server 2025 After Installation — step-by-step Windows Server 2025 tutorial on Progressive Robot

Initial Configuration of Windows Server 2025 After Installation

Initial Configuration of Windows Server 2025 After Installation Completing a fresh installation of Windows Server 2025 is only the first step. Before you can safely place a server into production, a series of critical configuration tasks must be completed: setting a meaningful hostname, assigning a static IP address, enabling remote access, hardening the firewall, synchronising […]

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How to Install Prometheus on FreeBSD 14 — step-by-step FreeBSD 14 tutorial on Progressive Robot

How to Install Prometheus on FreeBSD 14

Introduction How to Install Prometheus on FreeBSD 14 is a core administration task for any FreeBSD 14 server operator. FreeBSD 14 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 for packet filtering, and […]

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How to Set the Hostname on FreeBSD 14 — step-by-step FreeBSD 14 tutorial on Progressive Robot

How to Set the Hostname on FreeBSD 14

Introduction Deploying set the hostname on freebsd 14 on a FreeBSD 14 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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How to Configure Fail2Ban to Protect SSH on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure Fail2Ban to Protect SSH on RHEL 9

Even with SSH key authentication enabled, a badly configured or temporarily accessible server with password auth still faces a constant barrage of brute-force login attempts. Fail2ban monitors log files for authentication failures, counts them per source IP, and when a configured threshold is crossed it issues a temporary ban by injecting a drop rule via […]

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How to Configure Hyper-V Replication on Windows Server 2025 — step-by-step Windows Server 2025 tutorial on Progressive Robot

How to Configure Hyper-V Replication on Windows Server 2025

How to Configure Hyper-V Replication on Windows Server 2025 Hyper-V Replica is a built-in disaster recovery feature that provides asynchronous replication of virtual machines from a primary Hyper-V host to one or more replica hosts — without requiring a shared storage infrastructure or a Windows Server Failover Cluster. Changes made to a VM’s virtual hard […]

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Common Problems 116567

Ubuntu 24.04 LTS – SSH connection refused after reboot – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 6 December 2024 Affected versions: Ubuntu 24.04 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 Harden the FreeBSD Kernel with sysctl on FreeBSD 14 — step-by-step FreeBSD 14 tutorial on Progressive Robot

How to Harden the FreeBSD Kernel with sysctl on FreeBSD 14

Introduction How to Harden the FreeBSD Kernel with sysctl on FreeBSD 14 is a core administration task for any FreeBSD 14 server operator. FreeBSD 14 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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Common Problems 114571

RHEL 9 Subscription-Manager Shows Repositories Disabled Unexpectedly

🟡 Medium   ⏱ 5–30 min  Last verified: 6 December 2024 📖 ~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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