Logging Monitoring

How to Configure HashiCorp Vault on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure HashiCorp Vault on Debian 10

Introduction This guide explains how to Configure HashiCorp Vault on Debian 10 on Debian 10 Buster. Debian Buster 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 10 install with the standard […]

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How to Configure Email with Sendmail on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Configure Email with Sendmail on IBM AIX 7.1

Introduction IBM AIX 7.1 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to configure email with sendmail on ibm aix 7.1 on […]

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openSUSE Tumbleweed — dovecot23 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — dovecot23 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory openSUSE-SU-2025:14715-1 (see also SUSE bugzilla) Related CVEs: CVE-2017-14461 CVE-2019-11500 CVE-2019-3814 CVE-2020-10957 CVE-2020-12100 CVE-2020-12673 CVE-2020-12674 CVE-2020-24386  +12 more Upstream summary: A specially crafted email delivered over SMTP and passed on to Dovecot by […]

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Oracle Linux 8 — oniguruma — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — oniguruma — vulnerability — patch and remediation guide (ELSA-2024-0889)

🟡 Medium   ⏱ 10–30 min  Last verified: 20 July 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2024-0889 Related CVEs: CVE-2019-19203 CVE-2019-13224 CVE-2019-16163 CVE-2019-19204 CVE-2019-19012 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative […]

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Common Problems 120964

Debian 10 – apt update fails because repository Release file is expired

🟠 High   ⏱ 5–30 min  Last verified: 19 July 2020 Affected versions: Debian 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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Ubuntu 20.04 — teeworlds — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — teeworlds — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 19 July 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4553-1 Related CVEs: CVE-2020-12066 Upstream summary: It was discovered that Teeworlds server did not properly handler certain network traffic. A remote, unauthenticated attacker could use this vulnerability to cause Teeworlds […]

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Common Problems 113101

Windows Server 2016 — WSUS Synchronization Stalls and New Security Updates Never Appear — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 19 July 2020 Affected versions: Windows Server 2016 📖 ~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 112942

Windows Server 2016 — DHCP failover partnership enters communication interrupted state and lease replication stalls — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 19 July 2020 Affected versions: Windows Server 2016 📖 ~2 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 GELI Disk Encryption on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Configure GELI Disk Encryption on FreeBSD 12

Introduction How to Configure GELI Disk Encryption on FreeBSD 12 is a core administration task for any FreeBSD 12 server operator. FreeBSD 12 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet […]

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How to Set Up Kerberos KDC on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Set Up Kerberos KDC on IBM AIX 7.2

Introduction IBM AIX 7.2 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.2 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to set up kerberos kdc on ibm aix 7.2 on […]

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