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Oracle Linux 10 – sshd login is delayed by reverse DNS lookups and firewalld zone mismatch – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 20 September 2025 Affected versions: Oracle Linux 10 📖 ~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 strongSwan IPsec VPN on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Configure strongSwan IPsec VPN on Debian 13

Introduction Deploying configure strongswan ipsec vpn on a Debian 13 Trixie 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 You will need a registered […]

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How to Install Woodpecker CI on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Install Woodpecker CI on Debian 13

Introduction How to Install Woodpecker CI on Debian 13 is a fundamental operation for any administrator maintaining a Debian 13 Trixie server. Debian 13 Trixie ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 12. This […]

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How to Install Git on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Install Git on Debian 13

Introduction How to Install Git on Debian 13 is a fundamental operation for any administrator maintaining a Debian 13 Trixie server. Debian 13 Trixie ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 12. This tutorial […]

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How to Secure Nginx with Let's Encrypt SSL on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Configure Nginx Server Blocks (Virtual Hosts) on Ubuntu 24.04

Nginx server blocks (the equivalent of Apache virtual hosts) let you host multiple websites on a single server. This guide creates a server block for a custom domain on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server Nginx installed A domain name pointed to your server’s IP Step […]

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How to Install Bun on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Install Bun on Debian 13

Introduction Debian 13 Trixie is built around the ethos of stability and free software. Setting up install bun on Trixie leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Trixie freeze. Follow each step carefully and the resulting configuration will persist […]

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How to Install HAProxy on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Install HAProxy on Debian 13

Introduction How to Install HAProxy on Debian 13 is a fundamental operation for any administrator maintaining a Debian 13 Trixie server. Debian 13 Trixie ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 12. This tutorial […]

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How to Configure Rate Limiting in Nginx on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Configure Rate Limiting in Nginx on Debian 13

Introduction How to Configure Rate Limiting in Nginx on Debian 13 is a fundamental operation for any administrator maintaining a Debian 13 Trixie server. Debian 13 Trixie ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian […]

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How to Configure Static File Serving with Nginx on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Configure Static File Serving with Nginx on Debian 13

Introduction Deploying configure static file serving with nginx on a Debian 13 Trixie 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 Before you begin, […]

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How to Configure Sudo Privileges on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Configure Sudo Privileges on Debian 13

Introduction Deploying configure sudo privileges on a Debian 13 Trixie 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 You will need a registered Debian […]

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