2021 - Page 608 of 759

Common Problems 118425

NO_PUBKEY and Signature Verification Errors in apt

🟡 Medium   ⏱ 5–30 min  Last verified: 16 March 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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Common Problems 117432

Ubuntu 20.04 LTS – netplan apply fails due to YAML syntax error – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 16 March 2021 Affected versions: Ubuntu 20.04 LTS 📖 ~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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Gentoo Linux — app-arch/xar — vulnerability — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — app-arch/xar — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202405-19 Related CVEs: CVE-2021-30833 Upstream summary: A vulnerability has been discovered in xar. Please review the CVE identifier referenced below for details. Table of contents Symptom & Impact Environment & Reproduction Root […]

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Common Problems 113496

Windows Server 2012 R2 – NDIS lightweight filter drops packets after policy push – Fix and Prevention

🟠 High   ⏱ 5–30 min  Last verified: 16 March 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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Common Problems 113057

Windows Server 2016 — OneGet package install fails due to missing or duplicate package provider — Fix & Prevention

🟢 Low   ⏱ 5–30 min  Last verified: 16 March 2021 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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How to Configure a Firewall with nftables on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure a Firewall with nftables on Oracle Linux 8

Introduction Setting up configure a firewall with nftables on oracle linux 8 on a Oracle Linux 8 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Configure a Firewall with nftables on Oracle Linux 8, with all the commands you need, the SELinux and firewalld […]

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Common Problems 112470

Windows Server 2019 iSCSI Session Flapping Causes Intermittent LUN Disconnects – Fix & Prevention

🔴 Critical   ⏱ 5–30 min  Last verified: 16 March 2021 Affected versions: Windows Server 2019 📖 ~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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Understanding Open-Source Software Licenses — step-by-step DevOps tutorial on Progressive Robot

Understanding Open-Source Software Licenses

For software developers who may want to exercise a certain control over how their work is used, modified, and shared by others, choosing a software license is an important decision. Open-source software licenses are an option that makes source code available for use, modification, and distribution based on agreed-upon terms and conditions. In this article, we will share information about open-source software license types and the available options when creating a GitHub project.

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SLES 12 — iscsiuio — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — iscsiuio — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 16 March 2021 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-CU-2021:233-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-13987 CVE-2020-13988 CVE-2020-17437 CVE-2020-17438 Upstream summary: An issue was discovered in Contiki through 3.0. An Out-of-Bounds Read vulnerability exists in the uIP TCP/IP Stack component […]

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