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Configure Application-Level Rules within Azure Firewall

Azure Firewall is a cloud-native network security service that can be used to protect your Azure Virtual Network resources. Devices on a Virtual Network, such as Virtual Machines, by default, have access to the Internet (but usually not the other way around). Azure Firewall allows you to control access to the Internet from your Virtual Machines. In this lab, we will create an application-level rule in an Azure Firewall deployed in a Virtual Network to allow the Virtual Machine(s) to have access to a specific internet site. The preconfigured network will consist of three subnets, one with a jump box that you can remote into, another subnet with an application server, and the third subnet with the Azure Firewall. We will remote int the jump box, and from there remote into the application server. Once there, we will see that access to the Internet is disabled. We will then open a connection to www.google.com in the firewall and then check that the application server can now access it.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 45m
Last updated
Clock icon Sep 03, 2025

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Table of Contents

  1. Challenge

    Log in to the Azure Portal

    Log in to the Azure Portal using the username and password supplied by the lab.

    1. Open a browser.
    2. Navigate to the provided Azure Portal URL.
    3. Use the supplied username and password to authenticate.

  2. Challenge

    Remote into the Jump VM

    When you sign in to the VM with RDP, use the credentials provided on the lab page.

  3. Challenge

    Remote into the Work VM from the Jump VM

    From the Srv-Jump, remote into Srv-Work using Remote Desktop. Use the credentials for the Srv-work server provided on the lab page.

  4. Challenge

    Attempt to Open www.google.com from the Work VM

    1. Open Internet Explorer.
    2. When asked, select use default Internet Explorer security options.
    3. Enter www.google.com in the address bar and press enter.

    The browser will display a message that access to the site is denied.

  5. Challenge

    Configure the Firewall Rule to Allow Access to www.google.com from the Work VM

    In the Azure Portal, navigate to the firewall resource and configure a rule to allow access to the target FQDN of www.google.com for http and https traffic from anywhere within the linked virtual network.

    • Add application rule collection
    • Application rule collection Name: appcollection
    • Priority: 100
    • Target FQDNs name: wwwgooglecom

  6. Challenge

    Retry Opening www.google.com from the Work VM

    In the browser on the Work VM, refresh the page for www.google.com. We can now access the site, although we'll get a lot of questions from Internet Explorer about allowing access and content being blocked. That's ok. It's a response to finally being allowed through the firewall.

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Pluralsight Skills

Pluralsight Skills gives leaders confidence they have the skills needed to execute technology strategy. Technology teams can benchmark expertise across roles, speed up release cycles and build reliable, secure products. By leveraging our expert content, skill assessments and one-of-a-kind analytics, keep up with the pace of change, put the right people on the right projects and boost productivity. It's the most effective path to developing tech skills at scale.

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Follow along with the author’s guided walkthrough and build something new in your provided environment!

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