Boot Startup

Common Problems 122195

Unexpected Reboots Linked to Watchdog or Panic

🟡 Medium   ⏱ 5–30 min  Last verified: 28 December 2025 Affected versions: FreeBSD 15 📖 ~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 114020

RHEL 10 – chronyd not syncing time due to firewall and SELinux policy mismatch – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 28 December 2025 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~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 […]

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How to Configure nftables Firewall on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure nftables Firewall on RHEL 9

nftables is the modern successor to iptables and is the default firewall framework in RHEL 9. It replaces iptables, ip6tables, arptables, and ebtables with a single unified tool, offering better performance through an improved kernel path, atomic rule replacement, and a cleaner, more readable configuration syntax. This tutorial covers everything you need to know to […]

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Common Problems 113891

RHEL 10 – dnf upgrade fails with modular dependency conflicts – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 27 December 2025 Affected versions: RHEL 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 PAM on Oracle Linux 10 — step-by-step Oracle Linux 10 tutorial on Progressive Robot

How to Configure PAM on Oracle Linux 10

Introduction How to Configure PAM 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 reproducible […]

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Common Problems 114123

dnsmasq conflicts with system resolver on port 53

🟡 Medium   ⏱ 5–30 min  Last verified: 24 December 2025 Affected versions: RHEL 10.0 📖 ~1 min read Table of contents Problem Summary Symptoms Diagnostics Root Cause Primary Fix Verification Prevention Rollback Automation Command Reference Escalation Related Notes Problem Summary Local DNS service fails to bind because port 53 is already in use. Symptoms […]

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Common Problems 114052

NFS mount delays boot with long timeout

🟠 High   ⏱ 5–30 min  Last verified: 23 December 2025 Affected versions: RHEL 10.0 📖 ~1 min read Table of contents Problem Summary Symptoms Diagnostics Root Cause Primary Fix Verification Prevention Rollback Automation Command Reference Escalation Related Notes Problem Summary System startup hangs waiting for unreachable NFS mount targets. Symptoms Boot reaches emergency or […]

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How to Configure Bridge Networking on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Configure Bridge Networking on RHEL 10

Introduction Setting up configure bridge networking on a RHEL 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Configure Bridge Networking on RHEL 10, with all the commands you need, the SELinux and firewalld considerations to keep in mind, and how to validate the […]

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Debian 13 — twitter-bootstrap3 — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — twitter-bootstrap3 — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 22 December 2025 Affected versions: Debian 13 (trixie) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2016-10735 CVE-2018-14040 CVE-2018-14042 CVE-2018-20676 CVE-2018-20677 CVE-2019-8331 CVE-2024-6485 CVE-2025-1647 Upstream summary: In Bootstrap 3.x before 3.4.0 and 4.x-beta before 4.0.0-beta.2, XSS is possible in the data-target attribute, a different […]

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Common Problems 113991

RHEL 10 – boot drops to emergency mode from stale fstab UUID entry – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 21 December 2025 Affected versions: RHEL 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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