Firewall

Common Problems 124036

Oracle Linux 10 – nftables backend conflicts with legacy iptables tooling – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 29 October 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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Common Problems 124014

Oracle Linux 10 – dnf cannot download metadata due to mirror TLS validation errors – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 29 October 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 Set Up HTTP/2 in Nginx on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Set Up HTTP/2 in Nginx on RHEL 10

Introduction This tutorial demonstrates how to Set Up HTTP/2 in Nginx on RHEL 10 on RHEL 10. 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 RHEL 10 system with the default AppStream […]

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How to Set a Hostname on Oracle Linux 10 — step-by-step Oracle Linux 10 tutorial on Progressive Robot

How to Set a Hostname on Oracle Linux 10

Introduction This tutorial demonstrates how to Set a Hostname on Oracle Linux 10 on Oracle Linux 10. 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 Oracle Linux 10 system with the default […]

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How to Configure OpenDKIM with Postfix on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Configure OpenDKIM with Postfix on Debian 13

Introduction How to Configure OpenDKIM with Postfix 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. […]

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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 Install a LAMP Stack on Ubuntu 24.04

The LAMP stack — Linux, Apache, MySQL, and PHP — powers millions of web sites. This guide installs and integrates all four components on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server A user with sudo privileges UFW firewall configured Step 1 – Install Apache Install and enable […]

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How to Configure Nginx as a Reverse Proxy on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Configure Nginx as a Reverse Proxy on Debian 13

Introduction Debian 13 Trixie is built around the ethos of stability and free software. Setting up configure nginx as a reverse proxy 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 […]

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How to Install PHP 8.3 on Oracle Linux 10 — step-by-step Oracle Linux 10 tutorial on Progressive Robot

How to Install PHP 8.3 on Oracle Linux 10

Introduction How to Install PHP 8.3 on Oracle Linux 10 on Oracle Linux 10 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration is […]

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How to Set Up a DHCP Server with ISC DHCP on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Set Up a DHCP Server with ISC DHCP on RHEL 9

ISC DHCP (Internet Systems Consortium DHCP Server) is the most widely deployed open-source DHCP implementation and provides flexible IP address management for networks of any size. On RHEL 9, the dhcp-server package provides dhcpd, which handles both dynamic leases and static address reservations from a single configuration file. Although ISC announced the end-of-life of ISC […]

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How to Install Apache HTTP Server on Oracle Linux 10 — step-by-step Oracle Linux 10 tutorial on Progressive Robot

How to Install Apache HTTP Server on Oracle Linux 10

Introduction This tutorial demonstrates how to Install Apache HTTP Server on Oracle Linux 10 on Oracle Linux 10. 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 Oracle Linux 10 system with the […]

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