How to Enable Local Network Loopback for UWP Apps Facing 'net_http_client_execution_error'?

Troubleshooting UWP App Local Network Connectivity

Problem:

UWP applications often encounter a "net_http_client_execution_error" during installation when attempting to access localhost (127.0.0.1). This error prevents debugging, as it doesn't occur when running the app within Visual Studio.

Solution:

Enabling local network loopback access for your UWP app is achievable through the checknetisolation command-line tool. This is a targeted solution for specific applications.

Procedure:

1. Identify the Package Family Name:

   • Within Visual Studio, navigate to the Packaging tab of your project's Package.appxmanifest editor. The Package Family Name is visible there.
   • Alternatively, use the PowerShell command Get-AppxPackage to list installed packages and locate your app's Package Family Name.

2. Enable Loopback Exemption:

   • Open an elevated command prompt (Run as Administrator).

   • Execute the following command, replacing <package family name> with the actual name from step 1:

     <code class="language-cmd">checknetisolation loopbackexempt -a -n=<package family name></code>

3. Revoke Loopback Exemption (Optional):

   • To disable loopback access for the app, use this command (again, replace <package family name>):

     <code class="language-cmd">checknetisolation loopbackexempt -d -n=<package family name></code>

Important Considerations:

• If loopback access unexpectedly ceases to function, consider clearing all existing exemptions using:

  <code class="language-cmd">checknetisolation loopbackexempt -c</code>

• For comprehensive information, refer to the official Microsoft documentation (link may vary, search for "UWP Network Restrictions").

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