July 2020 - Page 14 of 69

How to Configure Nginx Rate Limiting and Connection Throttling on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Nginx Rate Limiting and Connection Throttling on RHEL 7

How to Configure Nginx Rate Limiting and Connection Throttling on RHEL 7 Uncontrolled traffic is one of the most common threats to web server stability. Whether the source is a poorly written client polling too aggressively, a scraper harvesting your content, or a low-volume denial-of-service attack, allowing unlimited requests to reach your application or upstream […]

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Configuração Inicial do Servidor com o CentOS 7 — step-by-step Linux tutorial on Progressive Robot

Configuração Inicial do Servidor com o CentOS 7

### Introdução Quando você cria inicialmente um novo servidor, existem alguns passos de configuração que você deve tomar no início como parte da configuração básica. Isto aumentará a segurança e a usabilidade do seu servidor e dará uma sólida fundação para as ações subsequentes.

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OpenBSD 7.6 — ssh — errata 013_ssh — reliability fix — syspatch and remediation — diagnosis and fix on OpenBSD 7.6

OpenBSD 7.6 — ssh — errata 013_ssh — reliability fix — syspatch and remediation

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: OpenBSD 7.6 📖 ~4 min read  •  Source: OpenBSD 7.6 errata 013_ssh Errata topic: Security: ssh (All architectures) Issued: April 9, 2025 Upstream summary: sshd(8) fix the DisableForwarding directive, which was failing to disable X11 forwarding and agent forwarding as documented. Table […]

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Common Problems 116072

Ubuntu 26.04 LTS – cloud-init hangs and instance provisioning never completes – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Ubuntu 26.04 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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openSUSE Tumbleweed — teeworlds — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — teeworlds — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory openSUSE-SU-2020:0557-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-20787 CVE-2020-12066 CVE-2014-9351 Upstream summary: Teeworlds before 0.7.4 has an integer overflow when computing a tilemap size. Table of contents Symptom & Impact Environment & […]

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Common Problems 116049

Ubuntu 26.04 LTS – Bluetooth adapter appears unavailable after suspend

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Ubuntu 26.04 LTS Ubuntu 26.04 Ubuntu 26.04.1 📖 ~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 […]

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Common Problems 114602

SELinux Boolean Not Persisting Across Reboot

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 📖 ~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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Ubuntu 16.04 — ruby-websocket-extensions — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — ruby-websocket-extensions — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4502-1 Related CVEs: CVE-2020-7663 Upstream summary: It was discovered that websocket-extensions does not properly parse special headers. A remote attacker could use this issue to cause regex backtracking, resulting in […]

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

How to Configure firewalld Zones on SLES 15

Introduction This tutorial covers How to Configure firewalld Zones 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. Prerequisites Ensure your SLES 15 system is up to date: zypper refresh […]

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Common Problems 112513

Windows Server 2019 — Static routes lost after reboot due to persistent store misconfiguration in Server 2019 — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 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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