/azure-firewall

name: azure-firewall
description: Expert knowledge for Azure Firewall development including troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. Use when configuring Azure Firewall SKUs, DNS/SNAT rules, TLS inspection, multi-hub routing, or DNAT for overlap, and other Azure Firewall related development tasks. Not for Azure Firewall Manager (use azure-firewall-manager), Azure Web Application Firewall (use azure-web-application-firewall), Azure Virtual Network (use azure-virtual-network), Azure Virtual Network Manager (use azure-virtual-network-manager).
compatibility: Requires network access. Uses mcp_microsoftdocs:microsoft_docs_fetch or fetch_webpage to retrieve documentation.
metadata:
  generated_at: "2026-09-06"
  generator: "docs2skills/1.0.0"

Azure Firewall Skill

This skill provides expert guidance for Azure Firewall. Covers troubleshooting, best practices, decision making, architecture & design patterns, 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 | L37-L42 | Diagnosing Azure Firewall issues using known limitations, packet captures, and Sentinel log analysis for malware detection and traffic investigation. | | Best Practices | L43-L48 | Best practices for Azure Firewall DNS proxy/caching, rule and SNAT tuning, using Policy Analytics to refine rules, and hardening firewall security and configuration | | Decision Making | L49-L56 | Guidance on selecting the right Azure Firewall SKU (Basic/Standard/Premium) using features, performance benchmarks, and deployment steps for Basic with portal and policy. | | Architecture & Design Patterns | L57-L67 | Designing Azure Firewall network architectures: multi-hub/spoke routing, forced tunneling, load balancer integration, control traffic, AVD/M365 protection, and DNAT for overlapping IP spaces. | | Limits & Quotas | L68-L76 | Azure Firewall capacity, IP and SNAT port limits, prescaling options, TCP idle timeouts, and how to scale/extend outbound connectivity (including via NAT Gateway V2). | | Security | L77-L90 | Securing Azure Firewall: policies, roles/permissions, TLS inspection certs, threat intelligence, AKS and hybrid protection, DNAT inbound rules, and portal-based deployment/configuration. | | Configuration | L91-L112 | Configuring Azure Firewall behavior: rules, IP groups, DNS, SNAT, dual-stack, HTTP/FTP/SQL settings, logging/monitoring, maintenance windows, and advanced Premium features. | | Integrations & Coding Patterns | L113-L117 | Configuring Azure Firewall to securely access Azure Storage via SFTP, including required rules, network paths, and integration patterns for SFTP traffic. | | Deployment | L118-L126 | Guides for deploying Azure Firewall (Standard/Premium), switching SKUs, using Bicep/ARM/Terraform, configuring IP Groups, and integrating with Azure DDoS Protection. |

Troubleshooting

| Topic | URL | |-------|-----| | Detect and investigate malware using Sentinel with Azure Firewall logs | https://learn.microsoft.com/en-us/azure/firewall/detect-malware-with-sentinel | | Troubleshoot Azure Firewall using packet capture | https://learn.microsoft.com/en-us/azure/firewall/packet-capture |

Best Practices

| Topic | URL | |-------|-----| | Understand Azure Firewall DNS proxy behavior and caching | https://learn.microsoft.com/en-us/azure/firewall/dns-details | | Optimize Azure Firewall performance with rule and SNAT tuning | https://learn.microsoft.com/en-us/azure/firewall/firewall-best-practices |

Decision Making

| Topic | URL | |-------|-----| | Select the appropriate Azure Firewall SKU | https://learn.microsoft.com/en-us/azure/firewall/choose-firewall-sku | | Deploy Azure Firewall Basic with portal and policy | https://learn.microsoft.com/en-us/azure/firewall/deploy-firewall-basic-portal-policy | | Choose the right Azure Firewall SKU by features | https://learn.microsoft.com/en-us/azure/firewall/features-by-sku | | Choose Azure Firewall SKU based on performance benchmarks | https://learn.microsoft.com/en-us/azure/firewall/firewall-performance |

Architecture & Design Patterns

| Topic | URL | |-------|-----| | Architect multi-hub and spoke routing with Azure Firewall | https://learn.microsoft.com/en-us/azure/firewall/firewall-multi-hub-spoke | | Design Azure Firewall forced tunneling architectures | https://learn.microsoft.com/en-us/azure/firewall/forced-tunneling | | Design Azure Firewall with Standard Load Balancer | https://learn.microsoft.com/en-us/azure/firewall/integrate-lb | | Use Azure Firewall Management NIC for control traffic | https://learn.microsoft.com/en-us/azure/firewall/management-nic | | Architect Azure Firewall protection for Azure Virtual Desktop | https://learn.microsoft.com/en-us/azure/firewall/prote