For IT admins: Intune, Entra ID, Microsoft 365, Apple, Windows

The failure, the fix, and the check that proves it worked.

Runbooks, configuration traps and guides for specific failures on managed Windows and Apple devices, Entra ID and Microsoft 365: the likely cause, the fix, and how to confirm it. Written with AI and checked by automated tests; each page says how it was produced.

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The KBY Brief

A short email about twice a week with new runbooks, configuration traps and fixes from KBY Technologies.

The Mission

Why KBY exists

Vendor documentation describes how a setting should behave. When a policy reports success and nothing changes on the device, or an app shows as installed and is not there, you need the likely causes and a way to tell them apart.

KBY Technologies publishes runbooks, configuration traps, guides and tools for that work.

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110 items

Systems Engineering

Advanced guides on infrastructure, cloud architecture, and observability for enterprise systems.

6 topics

Updated 9 Nov 2026

Latest Release:Linux Disk Full but df Shows Free Space: Inode Exhaustion Fix

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42 items

The Ops Playbook

L1-L3 Support Playbooks: engineer tickets out of existence.

12 topics

Updated 9 Nov 2026

Latest Release:Terraform Plan Shows Changes After Console Edits: Fixing Drift Safely

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31 items

Graduate Track

Production-focused guidance and step-by-step technical playbooks.

6 topics

Updated 9 Nov 2026

Latest Release:AWS VPC Instance Has No Internet Access: Check Route Table and NAT

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The Toolchain

Practical calculators, diagnostic scenarios, and reference material.

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On-Call Command Centre

Recovery procedures, dangerous defaults and rapid-response practice.

Browse all Runbooks

01

Runbook

HIGH · Grafana · target 30 minutes to isolate Grafana, proxy, query or backend timeout

Grafana Dashboard Data Source Timeout

Diagnose a Grafana dashboard data-source timeout by separating panel-query cost, Grafana data proxy limits, reverse-proxy deadlines, network reachability and backend saturation before raising any timeout.

Open resource

02

Runbook

CRITICAL · Active Directory · target 40 minutes to isolate the failing replication edge

Active Directory Domain Controller Replication Failure

Diagnose Active Directory domain controller replication failure with Repadmin, DCDiag, event IDs, DNS, RPC and time evidence; avoid forest-wide repadmin /syncall until topology knowledge is consistent and the exact error is resolved.

Open resource

03

Lexicon

MySQL

MySQL is a relational database management system queried with SQL. Learn what it is, how it fits in an architecture and what operators…

Open resource

04

Config Trap

AWS Identity

AWS Identity Controls Leave Workloads Exposed Until Verified

How to approach AWS identity exposure with read-only evidence, scoped changes, observable validation and a defined rollback.

Open resource

Interactive Showcase

Engineering Labs

Calculators, validators and lookups for planning and checking a change: subnets, ports, DNS records, cron schedules, tokens. Check results against vendor documentation before you change production.

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Newest Lab

Conditional Access What-If Matrix

Model a set of Conditional Access policies against one sign-in and see which policies apply, why the others don't, and whether access is blocked, granted, or granted after MFA.

Simulator

AdvancedUpdated 9 Nov 2026

Lexicon · Config Traps · Daily Triage

Daily Content

Fresh reference terms, dangerous defaults and two-minute incident scenarios, generated with AI and published on a daily schedule.

Lexicon9 Nov 2026

MySQL

MySQL is a relational database management system queried with SQL. Learn what it is, how it fits in an architecture and what operators…

AWS Identity Controls Leave Workloads Exposed Until Verified

How to approach AWS identity exposure with read-only evidence, scoped changes, observable validation and a defined rollback.

ALB Returns 502 and Targets Turn Unhealthy After Health Check Edit

A small platform team runs a web application behind an Application Load Balancer (ALB) with a target group of three instances. During a…

Knowledge Resources

Explore our reference materials, definitions, and utilities designed to provide fast, reliable answers to complex engineering questions.

Technology Index

Platforms, services and tools connected to KBY guidance.

Lexicon

Standardised technical definitions.

234+

Daily Triage

Two-minute incident decisions.

61+

Config Traps

Common misconfigurations.

140+

System Map

Visualise the stack.

Arcade

Interactive challenges.

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Curated Series

Editorial Collections

Deep dives and comprehensive guides on modern infrastructure and software architecture.

Tech Fundamentals

Beginner-friendly guides, troubleshooting tips, and IT essentials for home users and students.

19 articles

Software Architecture

System design, micro-frontends, and performance engineering for modern web applications.

17 articles

DevOps & Automation

Best practices for CI/CD, pipeline engineering, and performance optimization at scale.

16 articles

Security & Operations

Technical deep dives into network defenses, compliance, and automated threat detection.

11 articles

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