Firewall

How to Install Prometheus on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Install Prometheus on FreeBSD 12

Introduction Deploying install prometheus on freebsd 12 on a FreeBSD 12 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 112459

Windows Server 2019 — DHCP failover enters Communication Interrupted state — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 13 May 2020 Affected versions: Windows Server 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 […]

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How to Perform an Alternate Disk Migration on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Perform an Alternate Disk Migration on IBM AIX 7.1

Introduction IBM AIX 7.1 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 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to perform an alternate disk migration on ibm aix 7.1 […]

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How to Set Up a Python Django Application on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Set Up a Python Django Application on Debian 10

Introduction This guide explains how to Set Up a Python Django Application on Debian 10 on Debian 10 Buster. Debian Buster 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 10 install […]

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Common Problems 118498

SSH connection refused after reboot

🟡 Medium   ⏱ 5–30 min  Last verified: 12 May 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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How to Configure SSH Hardening on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure SSH Hardening on Debian 10

Introduction This guide explains how to Configure SSH Hardening on Debian 10 on Debian 10 Buster. Debian Buster 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 10 install with the standard […]

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Common Problems 119013

Ubuntu 14.04 LTS system clock drift and NTP sync failure

🟡 Medium   ⏱ 5–30 min  Last verified: 11 May 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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How to Implement Zero Trust Architecture on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Implement Zero Trust Architecture on Windows Server 2016

Introduction Zero Trust Architecture on Windows Server 2016 applies the principle of “never trust, always verify” to every connection and access request. Using native Windows capabilities — Credential Guard, Windows Firewall, JIT access, and audit logging — administrators can implement strong Zero Trust controls without additional tooling. Enabling Credential Guard Protect NTLM hashes and Kerberos […]

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How to Install GitLab Runner on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install GitLab Runner on Debian 10

Introduction This guide explains how to Install GitLab Runner on Debian 10 on Debian 10 Buster. Debian Buster 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 10 install with the standard […]

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Common Problems 112922

Windows Server 2016 — DNS scavenging removes active records due to aging configuration drift in AD-integrated zones — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 10 May 2020 Affected versions: Windows Server 2016 📖 ~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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