Troubleshooting

How to Configure TCP/IP Networking on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Configure TCP/IP Networking 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 tcp/ip networking on ibm aix 7.1 on IBM […]

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How to Install and Configure DB2 on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Install and Configure DB2 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 install and configure db2 on ibm aix 7.2 on […]

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How to Configure VLANs on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure VLANs on Windows Server 2016

How to Set Up VLAN Support on Windows Server 2016 Virtual Local Area Networks (VLANs) allow you to segment a physical network into multiple isolated logical networks. On Windows Server 2016, VLAN support is available through the built-in NIC teaming interface, the Hyper-V virtual switch, and directly on physical adapters using vendor-supplied drivers. Proper VLAN […]

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Amazon Linux 2 — python-cryptography — vulnerability — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — python-cryptography — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2025-2930 Related CVEs: CVE-2020-25659 Upstream summary: python-cryptography 3.2 is vulnerable to Bleichenbacher timing attacks in the RSA decryption API, via timed processing of valid PKCS#1 v1.5 ciphertext. (CVE-2020-25659) Table of […]

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openSUSE Tumbleweed — perl-XML-Twig — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — perl-XML-Twig — vulnerability — 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-2020:1177-1 (see also SUSE bugzilla) Related CVEs: CVE-2016-9180 Upstream summary: perl-XML-Twig: The option to `expand_external_ents`, documented as controlling external entity expansion in XML::Twig does not work. External entities are always expanded, regardless […]

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Common Problems 112992

Windows Server 2016 — RRAS NAT translation table saturation causes outbound traffic drops during peak usage — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 23 June 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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Common Problems 112433

Windows Server 2019 — DNSSEC validation failures after trust anchor rollover on Windows Server 2019 resolvers — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 23 June 2020 Affected versions: Windows Server 2019 📖 ~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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Alpine Linux edge — json-c — vulnerability — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — json-c — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 0.14-r1 📖 ~4 min read  •  Source: Alpine secdb entry — json-c 0.14-r1 Related CVEs: CVE-2020-12762 Upstream summary: Alpine main repository for vedge ships json-c 0.14-r1 which addresses CVE-2020-12762. Table of contents Symptom & Impact Environment […]

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How to Configure Btrfs on SLES 15 — step-by-step SUSE Linux Enterprise 15 tutorial on Progressive Robot

How to Configure Btrfs on SLES 15

Introduction This tutorial covers How to Configure Btrfs on SLES 15 on SLES 15. SLES 15 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Step 1 — Check Btrfs Filesystem btrfs filesystem show btrfs subvolume list / […]

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FreeBSD 12 — tnef — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — tnef — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 23 June 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: tnef — An attacker may be able to write to the victim's .ssh/authorized_keys file via an e-mail message Related CVEs: CVE-2017-6307 CVE-2017-6308 CVE-2017-6309 CVE-2017-6310 CVE-2019-18849 Upstream summary: [email protected] reports: In […]

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