web server

Common Problems 118039

Ubuntu 18.04 LTS SSL Certificate Chain Incomplete in Nginx

🟡 Medium   ⏱ 5–30 min  Last verified: 14 September 2019 Affected versions: 18.04 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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How to Set Up System Center Operations Manager (SCOM) on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up System Center Operations Manager (SCOM) on Windows Server 2019

Introduction to System Center Operations Manager System Center Operations Manager (SCOM) is Microsoft’s enterprise monitoring platform designed for large-scale Windows environments. It uses management packs — extensible plug-ins — to provide out-of-the-box monitoring intelligence for Windows Server operating systems, SQL Server, IIS, Active Directory, Hyper-V, and hundreds of third-party applications. SCOM uses agents deployed to […]

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Common Problems 118059

Ubuntu 18.04 LTS Apache 503 Service Unavailable Under Load

🟠 High   ⏱ 5–30 min  Last verified: 11 September 2019 Affected versions: 18.04 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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How to Configure IIS WebSockets on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure IIS WebSockets on Windows Server 2019

Introduction to IIS WebSockets on Windows Server 2019 WebSockets provide a full-duplex, persistent communication channel over a single TCP connection between a client and server. Unlike standard HTTP request/response, WebSockets allow the server to push data to clients without the client polling. This is used in real-time applications including chat systems, collaborative tools, live dashboards, […]

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How to Set Up a LEMP Stack on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Set Up a LEMP Stack on RHEL 7

How to Set Up a LEMP Stack on RHEL 7 A LEMP stack — Linux, Nginx, MySQL, and PHP — is one of the most common foundations for modern dynamic web applications. On RHEL 7 the individual components are available from a combination of the base repositories, the EPEL community repository, the official MySQL community […]

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Common Problems 119031

Ubuntu 14.04 LTS Apache returns 503 Service Unavailable under peak load

🟠 High   ⏱ 5–30 min  Last verified: 8 September 2019 Affected versions: 14.04 📖 ~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 […]

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How to Harden Web Servers: Security Headers, CSP and HSTS on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Harden Web Servers: Security Headers, CSP and HSTS on RHEL 7

How to Harden Web Servers: Security Headers, CSP and HSTS on RHEL 7 HTTP security headers are one of the most cost-effective controls available to web server administrators. They instruct the browser to enforce strict content handling rules, preventing common attacks such as cross-site scripting (XSS), clickjacking, MIME-type confusion, and protocol downgrade attacks — without […]

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How to Set Up IIS Centralized Certificate Store on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up IIS Centralized Certificate Store on Windows Server 2019

Introduction to IIS Centralized Certificate Store on Windows Server 2019 The IIS Centralized Certificate Store (CCS) allows you to store SSL/TLS certificates on a central UNC file share and have all IIS servers in a web farm read certificates directly from that share. Without CCS, you must manually install and renew certificates on every individual […]

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How to Configure IIS Authentication on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure IIS Authentication on Windows Server 2019

Introduction to IIS Authentication on Windows Server 2019 IIS 10 on Windows Server 2019 supports multiple authentication mechanisms, each suitable for different scenarios. Anonymous Authentication allows unauthenticated access (public websites). Windows Authentication uses Kerberos or NTLM to authenticate domain users transparently (intranet applications). Basic Authentication sends credentials in Base64 (requires HTTPS). Digest Authentication uses MD5 […]

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How to Enable HTTP/2 in Nginx on SLES 15 — step-by-step SUSE Linux Enterprise 15 tutorial on Progressive Robot

How to Enable HTTP/2 in Nginx on SLES 15

Introduction This tutorial covers How to Enable HTTP/2 in Nginx 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 […]

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