DNS

Common Problems 115575

RHEL 7 auditd Backlog Limit Reached

🟠 High   ⏱ 5–30 min  Last verified: 28 May 2021 Affected versions: RHEL 7 📖 ~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 Suricata IDS/IPS on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure Suricata IDS/IPS on RHEL 8

Suricata is a high-performance, open-source network threat detection engine that can operate as an Intrusion Detection System (IDS) to alert on suspicious traffic, or as an Intrusion Prevention System (IPS) to actively block it. On RHEL 8, Suricata integrates naturally with firewalld‘s NFQUEUE target for inline packet inspection, and its Lua scripting and Eve JSON […]

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Common Problems 117518

Ubuntu 20.04 LTS – SSH login fails with Permission denied (publickey)

🟠 High   ⏱ 5–30 min  Last verified: 27 May 2021 Affected versions: Ubuntu 20.04 LTS Ubuntu 20.04 Ubuntu 20.04.6 📖 ~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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Common Problems 113623

Windows Server 2012 R2 — Windows Update and web traffic fail due to bad proxy PAC settings — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 27 May 2021 Affected versions: Windows Server 2012 R2 📖 ~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 Secure Nginx with Let's Encrypt on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Secure Nginx with Let’s Encrypt on FreeBSD 12

Introduction Deploying secure nginx with let’s encrypt on freebsd 12 on a FreeBSD 12 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the […]

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Oracle Linux 8 — dnsmasq — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — dnsmasq — security and stability fixes — required update (ELSA-2021-4153)

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-4153 Related CVEs: CVE-2021-3448 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Common Problems 115023

RHEL 8 SSH login is slow due to DNS and GSSAPI timeouts

🟡 Medium   ⏱ 5–30 min  Last verified: 25 May 2021 📖 ~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 Configure Windows Server 2019 Active Directory Health Check — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure Windows Server 2019 Active Directory Health Check

How to Configure Windows Server 2019 Active Directory Health Check Regular Active Directory health checks are essential for maintaining a stable and reliable directory service. AD health issues — replication failures, DNS errors, outdated tombstone lifetimes, FSMO role problems — often develop silently and only surface when critical failures occur. Windows Server 2019 provides built-in […]

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Common Problems 118527

Ubuntu 16.04 LTS PHP 7.0-FPM not running

🟡 Medium   ⏱ 5–30 min  Last verified: 24 May 2021 📖 ~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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