web server

Common Problems 111651

Windows Server 2022 — IIS app pool identity account locked out causing 503 Service Unavailable — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 1 November 2022 Affected versions: Windows Server 2022 📖 ~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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Common Problems 111721

Windows Server 2022 — IIS SSL handshake failing due to deprecated TLS 1.0/1.1 cipher removal — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 31 October 2022 Affected versions: Windows Server 2022 📖 ~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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How to Write Ansible Playbooks for Server Automation on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Write Ansible Playbooks for Server Automation on RHEL 9

Ansible playbooks are YAML files that describe the desired state of a set of managed servers using a series of tasks. Advanced playbook authoring goes beyond simple task lists to include: roles (reusable, shareable task bundles with a standard directory structure), handlers (tasks triggered only when a change occurs, such as restarting Nginx only when […]

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Common Problems 117040

Ubuntu 22.04 LTS Nginx Fails to Reload Because of Duplicate Server Name

🟡 Medium   ⏱ 5–30 min  Last verified: 28 October 2022 📖 ~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 118592

Ubuntu 16.04 LTS – Apache fails to start with Address already in use – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 27 October 2022 Affected versions: Ubuntu 16.04 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 Monitor Windows Server 2016 with Nagios — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Monitor Windows Server 2016 with Nagios

How to Configure Windows Server 2016 with Nagios Nagios is one of the most widely deployed open-source monitoring platforms in enterprise environments. It provides comprehensive monitoring for servers, network devices, services, and applications, with a flexible plugin architecture that makes it highly extensible. Integrating Windows Server 2016 with Nagios gives your operations team real-time visibility […]

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Common Problems 121563

Debian 9: Nginx cannot bind to port 80

🟠 High   ⏱ 5–30 min  Last verified: 26 October 2022 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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Common Problems 111642

Windows Server 2022 — IIS Application Pool crashing with Event ID 5002 on Windows Server 2022 — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 26 October 2022 Affected versions: Windows Server 2022 📖 ~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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Common Problems 111759

Windows Server 2022 — WSUS Clients Stop Reporting Status After TLS Configuration Update — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 23 October 2022 Affected versions: Windows Server 2022 📖 ~1 min read Table of contents Symptom & Impact Quick Checks Deep Diagnosis Primary Fix Verification Prevention & Hardening Symptom & Impact WSUS shows stale client check-in dates after TLS or certificate changes on the update server. Patch […]

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How to Configure AppArmor for Nginx on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Configure AppArmor for Nginx on Debian 11

Introduction This guide explains how to Configure AppArmor for Nginx on Debian 11 on Debian 11 Bullseye. Debian Bullseye uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 11 install with the […]

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