How Can I Enable or Disable Local Loopback for My UWP App?

UWP Apps and Local Loopback: A Troubleshooting Guide

Developing UWP apps often presents the challenge of accessing localhost (127.0.0.1). Windows, by default, restricts this access, creating potential problems for many applications. This guide explains how to manage loopback access for your UWP app.

Granting Loopback Access:

The checknetisolation.exe tool (included with Windows) allows you to control loopback permissions. To enable loopback for your app, open an elevated command prompt and execute this command:

<code>c:\>checknetisolation loopbackexempt -a -n=<package family="" name=""></package></code>

Remember to replace <package family="" name=""> with your UWP app's package family name. This name is readily available in Visual Studio's Package.appxmanifest editor under the "Packaging" tab.

Revoking Loopback Access:

To disable loopback access, use this command in an elevated command prompt:

<code>c:\>checknetisolation loopbackexempt -d -n=<package family="" name=""></package></code>

Resolving Unexpected Issues:

If loopback exemptions unexpectedly cease to function, try clearing all existing exemptions using this command:

<code>c:\>checknetisolation loopbackexempt -c</code>

Then, re-apply the necessary exemptions individually.

For comprehensive information, consult Microsoft's official documentation: https://www.php.cn/link/10a9288f519d683f87f6443f7b6810e6

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