Firewall

How to Configure SSH Hardening on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Configure SSH Hardening on Debian 11

Introduction This guide explains how to Configure SSH Hardening on Debian 11 on Debian 11 Bullseye. Debian Bullseye 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 11 install with the standard […]

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How to Set Up Graylog on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Set Up Graylog on CentOS Stream 9

Introduction This tutorial demonstrates how to Set Up Graylog on CentOS Stream 9 on CentOS Stream 9. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered CentOS Stream 9 system with the default […]

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How to Install Harbor Container Registry on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Install Harbor Container Registry on Debian 11

Introduction Deploying install harbor container registry on debian 11 on a Debian 11 Bullseye 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 Ensure Debian […]

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How to Set Up Nginx Load Balancing on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Set Up Nginx Load Balancing on CentOS Stream 9

Introduction This tutorial demonstrates how to Set Up Nginx Load Balancing on CentOS Stream 9 on CentOS Stream 9. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered CentOS Stream 9 system with […]

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How to Configure Software RAID on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Configure Software RAID on CentOS Stream 9

Introduction CentOS Stream 9 ships with a stable, security-hardened base that makes deploying configure software raid on centos stream 9 both straightforward and auditable. This tutorial covers the complete procedure for how to Configure Software RAID on CentOS Stream 9, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for […]

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How to Set Up Site-to-Site VPN with RRAS on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Set Up Site-to-Site VPN with RRAS on Windows Server 2012 R2

How to Set Up Site-to-Site VPN with RRAS on Windows Server 2012 R2 A site-to-site VPN connects two geographically separate networks over the internet as if they were directly connected. Windows Server 2012 R2 RRAS (Routing and Remote Access Service) can act as a VPN gateway for site-to-site connections, establishing persistent encrypted tunnels between a […]

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Common Problems 120623

Debian 11: UFW blocks required application ports

🟡 Medium   ⏱ 5–30 min  Last verified: 16 March 2022 Affected versions: Debian 11 📖 ~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 Configure iptables Packet Filtering on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Configure iptables Packet Filtering on Debian 11

Introduction This guide explains how to Configure iptables Packet Filtering on Debian 11 on Debian 11 Bullseye. Debian Bullseye 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 11 install with the […]

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How to Set Up Datadog Agent on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Set Up Datadog Agent on CentOS Stream 9

Introduction CentOS Stream 9 ships with a stable, security-hardened base that makes deploying set up datadog agent on centos stream 9 both straightforward and auditable. This tutorial covers the complete procedure for how to Set Up Datadog Agent on CentOS Stream 9, including dnf module streams where applicable, systemd unit management, and the firewalld rules […]

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