Logging Monitoring

Common Problems 119108

NVIDIA Driver Upgrade Causes Black Screen on Ubuntu 14.04

🟡 Medium   ⏱ 5–30 min  Last verified: 15 August 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 118505

AppArmor Denials Break Application Behavior

🟡 Medium   ⏱ 5–30 min  Last verified: 15 August 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 115395

RHEL 7 yum Metadata Expired Behind Proxy

🟡 Medium   ⏱ 5–30 min  Last verified: 15 August 2020 Affected versions: RHEL 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 & Hardening Related Errors & […]

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Common Problems 115046

RHEL 8 Apache httpd Fails To Start Because Port Already In Use

🟡 Medium   ⏱ 5–30 min  Last verified: 15 August 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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How to Set Up NFS on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Set Up NFS 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 nfs on ibm aix 7.2 on IBM […]

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How to Install Keepalived for High Availability on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install Keepalived for High Availability on Debian 10

Introduction How to Install Keepalived for High Availability on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian […]

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How to Configure DKIM, SPF and DMARC on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure DKIM, SPF and DMARC on RHEL 8

Email authentication standards — SPF, DKIM, and DMARC — are the primary tools used by receiving mail servers to verify that messages claiming to come from your domain actually originate from your authorized infrastructure. Without them, your outbound mail is far more likely to land in spam folders or be rejected outright. On RHEL 8, […]

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Ubuntu 18.04 — snapcraft — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — snapcraft — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 14 August 2020 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4661-1 Related CVEs: CVE-2020-27348 https://launchpad.net/bugs/1901572 Upstream summary: It was discovered that Snapcraft includes the current directory when configuring LD_LIBRARY_PATH for application commands. If a user were tricked into installing a […]

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Common Problems 113025

Windows Server 2016 – IIS Windows Authentication Negotiate failing after binding changes – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 14 August 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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How to Set Up Bacula Client on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Set Up Bacula Client 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 set up bacula client on ibm aix 7.1 on […]

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