Troubleshooting

How to Configure a Virtual Host in Nginx on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure a Virtual Host in Nginx on Oracle Linux 8

Introduction Setting up configure a virtual host in nginx 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 Virtual Host in Nginx on Oracle Linux 8, with all the commands you need, the SELinux […]

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Ubuntu 20.04 — mailman — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — mailman — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 5 May 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8067-1 Related CVEs: CVE-2021-44227 CVE-2021-43331 CVE-2021-43332 CVE-2020-12108 CVE-2020-12137 CVE-2020-15011 CVE-2021-42096 CVE-2021-42097 Upstream summary: It was discovered that Mailman incorrectly handled CSRF tokens. A remote list member or moderator could possibly […]

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AlmaLinux 8 — libXrandr — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — libXrandr — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALEA-2020:4742 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Ubuntu 20.04 — mumble — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — mumble — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 5 May 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5195-1 Related CVEs: CVE-2021-27229 Upstream summary: It was discovered that the Mumble client supported websites for public servers with arbitrary URL schemes. If a user were tricked into visiting a […]

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AlmaLinux 8 — nasm — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — nasm — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALBA-2021:1966 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Ubuntu 20.04 — nanopb — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — nanopb — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 5 May 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6121-1 Related CVEs: CVE-2020-26243 CVE-2021-21401 Upstream summary: It was discovered that Nanopb incorrectly handled certain decode messages. An attacker could possibly use this cause a denial of service or expose […]

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SLES 12 — targetcli-fb — vulnerability — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — targetcli-fb — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 5 May 2021 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2020:2086-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-13867 Upstream summary: Open-iSCSI targetcli-fb through 2.1.52 has weak permissions for /etc/target (and for the backup directory and backup files). Table of contents Symptom & […]

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Oracle Linux 8 — java-17-openjdk — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — java-17-openjdk — security and stability fixes — required update (ELSA-2023-4159)

🟡 Medium   ⏱ 10–30 min  Last verified: 4 May 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-4159 Related CVEs: CVE-2023-22045 CVE-2023-22036 CVE-2023-22049 CVE-2023-25193 CVE-2023-22006 CVE-2023-22041 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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Common Problems 115514

Filesystem Remounted Read-Only After I/O Errors

🟡 Medium   ⏱ 5–30 min  Last verified: 4 May 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 112542

Windows Server 2019 – RunAs fails with logon type 2 not granted – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 4 May 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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CHAT