2020 - Page 315 of 735

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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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 July 2020 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: 25 July 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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Recommended Steps For New FreeBSD 12.0 Servers — step-by-step Linux tutorial on Progressive Robot

Recommended Steps For New FreeBSD 12.0 Servers

When setting up a new FreeBSD server, there are a number of optional steps you can take to get your server into a more production-friendly state. In this guide, we will go over some of the most common examples. We will cover how to create a firewall that denies most traffic, ensure that your server’s time zone accurately reflects its location, and set up NTP polling to keep the server’s time accurate. Finally, we will demonstrate how to add some extra swap space to your server.

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How To Use Cron to Automate Tasks on Ubuntu 18.04 — step-by-step Linux tutorial on Progressive Robot

How To Use Cron to Automate Tasks on Ubuntu 18.04

Cron is a time-based job scheduling daemon found in Unix-like operating systems, including Linux distributions. This guide provides an overview of how to schedule tasks using cron’s special syntax on a machine running Ubuntu 18.04. It also goes over a few shortcuts one can use to make job schedules easier to write and understand.

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Ubuntu 20.04 — pcre3 — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — pcre3 — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 July 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5425-1 Related CVEs: CVE-2019-20838 CVE-2020-14155 Upstream summary: Yunho Kim discovered that PCRE incorrectly handled memory when handling certain regular expressions. An attacker could possibly use this issue to cause applications […]

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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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