🟡 Medium ⏱ 5–30 min Last verified: 6 January 2020 Affected versions: Ubuntu 14.04 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 […]
How to Set Up Windows Server 2016 Windows Firewall Windows Firewall with Advanced Security is a host-based firewall built into Windows Server 2016. It provides bi-directional traffic filtering, connection security rules, and integration with IPsec. Properly configuring the firewall is essential for securing your server against unauthorized access while allowing legitimate traffic to pass. This […]
Introduction This guide explains how to Configure Postfix Mail Server on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 install with the […]
Keeping a RHEL 8 server patched against known vulnerabilities is one of the most impactful security practices an administrator can adopt. While manual dnf update runs give you full control, many servers benefit from automatic application of security-only patches without requiring human intervention. RHEL 8 provides the dnf-automatic package, which integrates with systemd timers to […]
Introduction to Advanced PowerShell Scripting for Windows Server 2019 Windows Server 2019 ships with PowerShell 5.1 by default, and PowerShell 7.x can be installed side-by-side. Advanced scripting on this platform goes well beyond one-liners. A professional administrator writes scripts that are modular, error-tolerant, self-documenting, and safe to run in production. This guide covers the patterns […]
Introduction IBM AIX 7.2 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.2 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to configure email with sendmail on ibm aix 7.2 on […]
Introduction to Scheduled Task-Based Backup Scripts on Windows Server 2019 While enterprise backup solutions like Veeam or Azure Backup provide comprehensive protection, many organizations also use custom PowerShell and batch scripts for targeted, supplemental backups — backing up specific application data, configuration files, database exports, or IIS content on a schedule. Windows Task Scheduler is […]
How to Configure Windows Server 2019 for High Availability High Availability (HA) in Windows Server 2019 is achieved through multiple technologies that eliminate single points of failure. The primary HA technologies include Failover Clustering for automatic failover of roles and virtual machines, Network Load Balancing for distributing workloads across multiple servers, Always On Availability Groups […]
Introduction to Active Directory Replication Active Directory is a distributed database. In a multi-domain-controller environment, changes made on one DC must propagate to all other DCs in the domain. This process is called replication. Windows Server 2019 uses two replication topologies: intrasite replication (within a site, using RPCs over TCP/IP, triggered within seconds) and intersite […]
Introduction How to Configure OpenDKIM with Postfix 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 for packet […]
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