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WAF installation guide

Azure WAF with Front Door Evaluation Guide

A practical guide for evaluating Azure Web Application Firewall on Azure Front Door or Application Gateway.

Quick answer

How to use this Azure WAF with Front Door Evaluation Guide

Create a dedicated Front Door WAF policy in Detection mode, bind it to one controlled domain, validate managed-rule logs and exclusions, then promote narrow rules to Prevention mode.

Difficulty
Intermediate
Time
60-120 minutes for a staged rollout
Updated
2026-07-17

Guide data

Difficulty
Intermediate
Time
60-120 minutes for a staged rollout
Updated
2026-07-17
Use case
Useful when a team is planning Azure WAF for Azure Front Door, Application Gateway, or Azure-hosted applications.

Prerequisites

  • Azure subscription access.
  • A test Front Door or Application Gateway path.
  • Permission to edit WAF policy and diagnostics settings.
  • A plan for reviewing logs in Azure Monitor or related tooling.

Deployment workflow

Prove the Front Door policy in Detection mode first.

1

Pick the Azure entry point

Azure WAF behavior depends on whether protection is attached to Front Door or Application Gateway. Start by matching the policy to the actual traffic path.

  • Entry point is identified.
  • Policy attachment is visible.
  • Diagnostics are enabled.
2

Use prevention only after observation

Detection mode helps teams understand managed rule behavior before enabling prevention for high-value paths.

  • Managed rule hits are visible.
  • False positives are grouped.
  • Critical workflows are tested.
3

Tune exclusions and custom rules

Keep custom rules and exclusions narrow. Document the path, parameter, and business reason for each exception.

  • Each exclusion has a reason.
  • Clean workflow passes.
  • Related attack-like payloads still trigger controls.

Validation checklist

  • Confirm requests pass through the selected Azure WAF policy.
  • Review detection logs before prevention mode.
  • Test login, upload, and API workflows.
  • Document cost and diagnostics retention.

Rollback planning

  • Keep prevention changes separate from routing changes.
  • Be able to return to detection mode quickly.
  • Track policy versions or export configuration before major edits.

Common mistakes

  • Confusing Front Door WAF behavior with Application Gateway WAF behavior.
  • Enabling prevention mode before reviewing logs.
  • Creating broad exclusions that hide useful detections.

Related WAF profiles

Azure Web Application Firewall

FAQ

What does the Azure WAF with Front Door Evaluation Guide workflow validate?

It validates policy association, managed rule-set version, Detection events, diagnostic logs, exclusion behavior, origin reachability, and policy detachment as rollback.

What must pass before Azure WAF with Front Door Evaluation Guide is used in production?

Prevention mode should wait until logs cover normal traffic peaks, exclusions are narrow, health and API paths are verified, alerts exist, and the detach or policy rollback is tested.

Sources