Can't open localhost in Microsoft Edge (Project Spartan) in Windows 10 preview

Question

I installed Windows 10 preview and installed IIS.

Open "http://localhost" in Project Spartan can't connect.

IE has no problem. What's the problem?

Answer 1

So the issue is Spartan Edge doesn't have access to the loopback addresses, which is something that most Windows Store apps are blocked from accessing.

If you are using Windows 10 RTM or build 10166, this can be done by navigating to about:flags and checking "Allow localhost loopback":

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If you are using a previous build of Windows 10, the CheckNetIsolation tool can be used to add it to the LoopbackExempt list. Use this from an elevated command prompt:

CheckNetIsolation LoopbackExempt -a -n="Microsoft.MicrosoftEdge_8wekyb3d8bbwe"

Microsoft.MicrosoftEdge_8wekyb3d8bbwe is the identifier for the Edge app. It can be determined by using Get-AppxPackage in PowerShell and sifting through the results for the Spartan / Edge and using the PackageFamilyName.

As of Build 10158, the PackageFamilyName has changed from Microsoft.Windows.Spartan_cw5n1h2txyewy to Microsoft.MicrosoftEdge_8wekyb3d8bbwe.