chris

Common Problems 115532

Postfix mail queue stuck and undelivered

🟡 Medium   ⏱ 5–30 min  Last verified: 17 September 2020 📖 ~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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openSUSE Tumbleweed — iscsiuio — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — iscsiuio — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory SUSE-CU-2021:233-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-13988 CVE-2020-17437 Upstream summary: An issue was discovered in Contiki through 3.0. An Integer Overflow exists in the uIP TCP/IP Stack component when parsing TCP […]

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

How to Configure YaST on SLES 15

Introduction This tutorial covers How to Configure YaST 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 — Launch YaST yast Step 2 — Use YaST from the […]

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Common Problems 114944

RHEL 8 chronyd Time Drift and NTP Sync Failure

🟡 Medium   ⏱ 5–30 min  Last verified: 17 September 2020 📖 ~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 112473

Windows Server 2019 — DHCP NACK storms after VLAN resegmentation create widespread endpoint disconnects — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 17 September 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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Fix for log4j WARN No appenders could be found for logger, Please initialize the log4j system properly — Programming tutorial on Progressive Robot

Fix for log4j WARN No appenders could be found for logger, Please initialize the log4j system properly

URL: https://www.progressiverobot.com/log4j-warn-no-appenders-could-be-found-for-logger-please-initialize-the-log4j-system-properly/ If you are reading this, you must be using log4j framework and got below error message. log4j:WARN No appenders could be found for logger log4j:WARN Please initialize the log4j system properly. log4j:WARN See https://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. Log4j warning for no appenders will come to console for standalone applications and in server logs […]

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How to Configure OpenTelemetry Collector on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure OpenTelemetry Collector on Debian 10

Introduction Debian 10 Buster is built around the ethos of stability and free software. Setting up configure opentelemetry collector on debian 10 on Buster leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Buster freeze. Follow each step carefully and the […]

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OpenBSD 7.4 — ssh — errata 011_ssh — reliability fix — syspatch and remediation — diagnosis and fix on OpenBSD 7.4

OpenBSD 7.4 — ssh — errata 011_ssh — reliability fix — syspatch and remediation

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: OpenBSD 7.4 📖 ~4 min read  •  Source: OpenBSD 7.4 errata 011_ssh Errata topic: Security: ssh (All architectures) Issued: December 18, 2023 Upstream summary: An SSH protocol weakness (the Terrapin Attack) exists that allows an on-path adversary to disable keystroke timing obfuscation. […]

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