web server

How to Configure Desired State Configuration (DSC) on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure Desired State Configuration (DSC) on Windows Server 2016

How to Configure Windows Server 2016 Desired State Configuration Desired State Configuration (DSC) is a management platform built into Windows PowerShell that enables administrators to define the intended state of a server through declarative configuration scripts. Rather than writing imperative scripts that perform individual tasks, DSC lets you describe what a system should look like […]

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How to Set Up BranchCache on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Set Up BranchCache on Windows Server 2012 R2

How to Set Up IIS 8.5 Reverse Proxy on Windows Server 2012 R2 IIS 8.5 on Windows Server 2012 R2, combined with the Application Request Routing (ARR) extension and URL Rewrite module, creates a powerful reverse proxy platform that can load-balance web applications, forward requests to backend servers, terminate SSL, and provide WAF-like URL filtering. […]

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How to Configure Apache with mod_security on SLES 12 — step-by-step SUSE Linux Enterprise 12 tutorial on Progressive Robot

How to Configure Apache with mod_security on SLES 12

Introduction This tutorial covers How to Configure Apache with mod_security on SLES 12 on SLES 12. SLES 12 (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 12 system is up to date: zypper […]

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Common Problems 121573

Debian 9: Apache returns 503 because PHP-FPM socket is missing

🟠 High   ⏱ 5–30 min  Last verified: 1 March 2020 Affected versions: Debian 9 📖 ~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 Configure SELinux on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure SELinux on RHEL 7

How to Configure SELinux on RHEL 7 SELinux (Security-Enhanced Linux) is a mandatory access control (MAC) system built into the Linux kernel and enabled by default on every RHEL 7 installation. Unlike traditional Unix discretionary access control (DAC), which lets file owners decide who can access their files, SELinux enforces a policy defined by the […]

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How to Configure IPv6 Networking on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure IPv6 Networking on RHEL 8

IPv6 adoption has accelerated significantly as IPv4 address exhaustion becomes more acute, and most modern Linux distributions including RHEL 8 ship with full IPv6 support enabled by default. Configuring IPv6 on RHEL 8 requires working with nmcli for network interface configuration, firewalld for controlling IPv6 traffic including ICMPv6, and optionally adjusting service configurations to bind […]

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Common Problems 118077

Ubuntu 18.04 Apache 503 Errors from PHP-FPM Socket Permission Issues

🟡 Medium   ⏱ 5–30 min  Last verified: 20 February 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 Enable Brotli Compression on Nginx on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Enable Brotli Compression on Nginx on Debian 10

Introduction How to Enable Brotli Compression on Nginx 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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Common Problems 118507

Ubuntu 16.04 LTS Apache2 fails to start because port 80 is in use

🟡 Medium   ⏱ 5–30 min  Last verified: 19 February 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 Install Portainer for Docker Management on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install Portainer for Docker Management on RHEL 7

How to Install Portainer for Docker Management on RHEL 7 Portainer is an open-source container management UI that puts a graphical interface in front of Docker, Swarm, and Kubernetes. Instead of memorising dozens of docker subcommands, Portainer lets you inspect containers, manage images and volumes, view real-time logs, open an in-browser terminal, and deploy stacks […]

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