/azure-web-application-firewall

name: azure-web-application-firewall
description: Expert knowledge for Azure Web Application Firewall development including troubleshooting, best practices, decision making, limits & quotas, security, configuration, integrations & coding patterns, and deployment. Use when configuring Front Door/App Gateway WAF rules, rate limits, geo/bot controls, logging, or Sentinel integration, and other Azure Web Application Firewall related development tasks. Not for Azure Application Gateway (use azure-application-gateway), Azure Front Door (use azure-front-door), Azure Firewall (use azure-firewall), Azure DDos Protection (use azure-ddos-protection).
compatibility: Requires network access. Uses mcp_microsoftdocs:microsoft_docs_fetch or fetch_webpage to retrieve documentation.
metadata:
  generated_at: "2026-07-19"
  generator: "docs2skills/1.0.0"

Azure Web Application Firewall Skill

This skill provides expert guidance for Azure Web Application Firewall. Covers troubleshooting, best practices, decision making, limits & quotas, security, configuration, integrations & coding patterns, and deployment. It combines local quick-reference content with remote documentation fetching capabilities.

How to Use This Skill

> **IMPORTANT for Agent**: Use the **Category Index** below to locate relevant sections. For categories with line ranges (e.g., `L35-L120`), use `read_file` with the specified lines. For categories with file links (e.g., `[security.md](security.md)`), use `read_file` on the linked reference file

> **IMPORTANT for Agent**: If `metadata.generated_at` is more than 3 months old, suggest the user pull the latest version from the repository. If `mcp_microsoftdocs` tools are not available, suggest the user install it: [Installation Guide](https://github.com/MicrosoftDocs/mcp/blob/main/README.md)

This skill requires **network access** to fetch documentation content:

• **Preferred**: Use `mcp_microsoftdocs:microsoft_docs_fetch` with query string `from=learn-agent-skill`. Returns Markdown.
• **Fallback**: Use `fetch_webpage` with query string `from=learn-agent-skill&accept=text/markdown`. Returns Markdown.

Category Index

| Category | Lines | Description | |----------|-------|-------------| | Troubleshooting | L36-L40 | Diagnosing and fixing Azure WAF issues on Front Door and Application Gateway, including rule matches, false positives, blocked requests, and configuration or logging problems. | | Best Practices | L41-L48 | Best practices for configuring, tuning, and hardening WAF on Front Door and Application Gateway, including geomatch rules, exclusions, and security posture improvements. | | Decision Making | L49-L54 | Guidance on planning and migrating from legacy WAF configs to full WAF policies, and managing the lifecycle, upgrades, and versions of Azure WAF managed rule sets. | | Limits & Quotas | L55-L60 | Details on WAF limits like max request/body size, file upload constraints, rule engine behavior under high load, and how to configure or tune these limits on Application Gateway. | | Security | L61-L70 | Configuring and governing WAF security: IP restrictions, DRS rule groups, exclusions/exceptions, hardening settings, and enforcing policies with Azure Policy. | | Configuration | L71-L111 | Configuring WAF policies and rules for Front Door and Application Gateway: custom/managed rules, rate limiting, geo-filtering, bot/CAPTCHA, exclusions, logging, and sensitive data protection. | | Integrations & Coding Patterns | L112-L122 | Using WAF with other Azure services: integrating logs with Sentinel/Log Analytics, automating incident response, investigating events, and protecting APIM/Azure OpenAI via Front Door WAF. | | Deployment | L123-L129 | How to deploy and manage Application Gateway WAF v2 using Bicep, ARM templates, Terraform, and upgrade existing WAF configurations to WAF policies. |

Troubleshooting

| Topic | URL | |-------|-----| | Troubleshoot Azure Front Door WAF behavior and rules | https://learn.microsoft.com/en-us/azure/web-application-firewall/afds/waf-faq |

Best Practices

| Topic | URL | |-------|-----| | Implement WAF best practices in Azure Front Door | https://learn.microsoft.com/en-us/azure/web-application-firewall/afds/waf-front-door-best-practices | | Tune Azure Front Door WAF rules and exclusions | https://learn.microsoft.com/en-us/azure/web-application-firewall/afds/waf-front-door-tuning | | Apply best practices for WAF on Application Gateway | https://learn.microsoft.com/en-us/azure/web-application-firewall/ag/best-practices | | Apply geomatch WAF rules to strengthen web app security | https://learn.microsoft.com/en-us/azure/web-application-firewall/geomatch-custom-rules-examples |

Decision Making

| Topic | URL | |-------|-----| | Migrate Azure Application Gateway WAF configs to full policies | https://learn.microsoft.com/en-us/azure/web-application-firewall/ag/migrate-policy | | Plan Azure WAF managed ruleset lifecycle and upgrades | https://learn.microsoft.com/en-us/azure/web-application-firewall/ruleset-support-policy |

Limits & Quotas

| Topic | URL | |-------|-----| | Understand Azure Application Gateway WAF limits and behavior | https://learn.microsoft.com/en-us/azure/web-application-firewall/ag/application-gateway-waf-faq | | Configure WAF request and file upload size limits on Application Gateway | https://learn.microsoft.com/en-us/azure/web-application-firewall/ag/application-gateway-waf-request-size-limits |

Security

| Topic | URL | |-------|-----| | Configure IP restriction rules in Front Door WAF | https://learn.microsoft.com/en-us/azure/web-application-firewall/afds/waf-front-door-configure-ip-restriction | | Understand Azure WAF Front Door DRS rule groups | https://learn.microsoft.com/en-us/azure/web-application-firewall/afds/waf-front-door-drs | | Configure WAF exclusion lists for Azure Front Door | https://learn.microsoft.com/en-us/azure/web-application-firewall/afds/waf-front-door-exclusion | | Configure WAF excep