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How to Set Up Windows Server Cluster-Aware Updating (CAU) on Windows Server 2022 — step-by-step Windows Server 2022 tutorial on Progressive Robot

How to Set Up Windows Server Cluster-Aware Updating (CAU) on Windows Server 2022

What Is Cluster-Aware Updating and Why It Matters Cluster-Aware Updating (CAU) is a Windows Server feature that automates the process of applying software updates to failover cluster nodes with zero planned downtime. Without CAU, patching a cluster requires a manual, error-prone procedure: drain one node, patch it, reboot, wait for it to rejoin, verify cluster […]

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Debian 11 — optipng — multiple vulnerabilities (10 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — optipng — multiple vulnerabilities (10 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2008-5101 CVE-2009-0749 CVE-2015-7801 CVE-2015-7802 CVE-2016-2191 CVE-2016-3981 CVE-2016-3982 CVE-2017-1000229  +2 more Upstream summary: Buffer overflow in the BMP reader in OptiPNG 0.6 and 0.6.1 allows user-assisted attackers to execute […]

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Common Problems 118596

Ubuntu 16.04 LTS – system clock drifts and NTP is unsynchronized

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Ubuntu 16.04 LTS Ubuntu 16.04 Ubuntu 16.04.7 📖 ~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 […]

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Debian 11 — inn2 — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — inn2 — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2001-1442 CVE-2004-0045 CVE-2012-3523 Upstream summary: Buffer overflow in innfeed for ISC InterNetNews (INN) before 2.3.0 allows local users in the "news" group to gain privileges via a long […]

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Common Problems 117126

Ubuntu 22.04 kdump Fails to Capture Kernel Crash Dumps

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 📖 ~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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Debian 11 — mp3splt — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — mp3splt — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2017-15185 CVE-2017-5665 CVE-2017-5666 CVE-2017-5851 Upstream summary: plugins/ogg.c in Libmp3splt 0.9.2 calls the libvorbis vorbis_block_clear function with uninitialized data upon detection of invalid input, which allows remote attackers to […]

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Common Problems 113052

Windows Server 2016 — Direct Server Return mode misconfiguration breaks SSL health probes in NLB — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 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 Use sar for System Activity Reporting on IBM AIX 7.3 — step-by-step IBM AIX 7.3 tutorial on Progressive Robot

How to Use sar for System Activity Reporting on IBM AIX 7.3

Introduction IBM AIX 7.3 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 7.3 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to use sar for system activity reporting on IBM AIX […]

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Debian 11 — dom4j — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — dom4j — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2018-1000632 CVE-2020-10683 Upstream summary: dom4j version prior to version 2.1.1 contains a CWE-91: XML Injection vulnerability in Class: Element. Methods: addElement, addAttribute that can result in an attacker […]

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Debian 11 — jbigkit — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — jbigkit — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2013-6369 CVE-2017-9937 Upstream summary: Stack-based buffer overflow in the jbg_dec_in function in libjbig/jbig.c in JBIG-KIT before 2.1 allows remote attackers to cause a denial of service (application crash) […]

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