Firewall

Common Problems 124041

Oracle Linux 10 – chronyd not syncing time behind restrictive firewall – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 5 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 Analyse Network Traffic with tshark on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Analyse Network Traffic with tshark on Debian 13

Introduction This guide explains how to Analyse Network Traffic with tshark on Debian 13 on Debian 13 Trixie. Debian Trixie 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 13 install with […]

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How to Generate SSL Certificates with openssl on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Generate SSL Certificates with openssl on Debian 13

Introduction This guide explains how to Generate SSL Certificates with openssl on Debian 13 on Debian 13 Trixie. Debian Trixie 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 13 install with […]

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Common Problems 114536

Podman Permission Denied Errors on RHEL 9

🟡 Medium   ⏱ 5–30 min  Last verified: 5 October 2025 📖 ~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 Install MariaDB 11 on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Install MariaDB 11 on Debian 13

Introduction How to Install MariaDB 11 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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Common Problems 127162

CentOS Stream 10 – Common Problem 145 – Diagnosis and Fix

🟠 High   ⏱ 5–30 min  Last verified: 4 October 2025 Affected versions: CentOS Stream 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 Use tmux on Oracle Linux 10 — step-by-step Oracle Linux 10 tutorial on Progressive Robot

How to Use tmux on Oracle Linux 10

Introduction This tutorial demonstrates how to Use tmux 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 AppStream […]

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Common Problems 124077

Oracle Linux 10 – systemctl daemon-reload required loop after unit override changes – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 4 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 119544

Debian 13 – UFW policy blocks package downloads and outbound HTTPS

🟡 Medium   ⏱ 5–30 min  Last verified: 4 October 2025 Affected versions: Debian 13 Debian 13 (Trixie) Debian 13.x 📖 ~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 […]

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How to Configure DHCP Server with isc-dhcp-server on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Configure DHCP Server with isc-dhcp-server on Debian 13

Introduction Deploying configure dhcp server with isc-dhcp-server 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 […]

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