Firewall

How to Configure Nginx as a TCP/UDP Load Balancer on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure Nginx as a TCP/UDP Load Balancer on Debian 9 (ON-DEBIAN-9)

Introduction Debian 9 Stretch is built around the ethos of stability and free software. Setting up configure nginx as a tcp/udp load balancer on debian 9 on Stretch leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Stretch freeze. Follow each […]

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Common Problems 115418

RHEL 7 firewalld Blocks Internal App Port After Reload

🟡 Medium   ⏱ 5–30 min  Last verified: 2 August 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 Configure Syslog on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Configure Syslog 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 configure syslog on ibm aix 7.1 on IBM AIX […]

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How to Install and Configure RRAS on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Install and Configure RRAS on Windows Server 2012 R2

How to Install and Configure RRAS on Windows Server 2012 R2 Routing and Remote Access Service (RRAS) is a comprehensive Windows Server feature that provides a wide range of network services including VPN server, dial-up remote access, network address translation (NAT), demand-dial routing, and multi-protocol LAN-to-LAN and LAN-to-WAN routing. On Windows Server 2012 R2, RRAS […]

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Common Problems 115457

sshd Starts but Remote Access Still Fails

🟡 Medium   ⏱ 5–30 min  Last verified: 1 August 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 Detect Rootkits with rkhunter and chkrootkit on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Detect Rootkits with rkhunter and chkrootkit on RHEL 7

How to Detect Rootkits with rkhunter and chkrootkit on RHEL 7 A rootkit is a collection of malicious software designed to maintain persistent, hidden access to a compromised system while concealing its presence from the administrator and standard system tools. Once installed, rootkits can replace core binaries, hide processes and network connections, and exfiltrate data […]

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How to Set Up Active Directory Tiered Administration on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Set Up Active Directory Tiered Administration on Windows Server 2012 R2

How to Set Up Active Directory Tiered Administration on Windows Server 2012 R2 The Microsoft Active Directory Tiered Administration model is a security architecture that separates administrative accounts and systems into three tiers to prevent credential theft attacks from escalating across the entire environment. Tier 0 contains the most critical assets — Domain Controllers, PKI […]

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Common Problems 115076

RHEL 8 rsyslog Not Forwarding Logs To Remote SIEM

🟡 Medium   ⏱ 5–30 min  Last verified: 30 July 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 Set Up Windows Server 2019 with Grafana — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up Windows Server 2019 with Grafana

How to Set Up Windows Server 2019 with Grafana Grafana is an open-source analytics and visualization platform that, when combined with a time-series data source, provides powerful dashboards for Windows Server 2019 monitoring. The typical architecture uses Windows Exporter (formerly wmi_exporter) to expose Prometheus-compatible metrics from Windows Server 2019, a Prometheus server to scrape and […]

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How to Install and Configure Caddy Web Server on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Install and Configure Caddy Web Server on RHEL 8

Caddy is a modern, open-source web server written in Go that automatically provisions and renews TLS certificates via Let’s Encrypt. Unlike Apache or Nginx, Caddy requires almost no manual TLS configuration, making it an excellent choice for developers who want HTTPS out of the box. On RHEL 8, Caddy is not available in the default […]

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