I’m using Windows 10 as my primary OS now, maybe that’s a bit nuts but hey 10162 is a lot more stable than some of the early builds, and the driver support is pretty good now too.

I fired up an Angular project I’d been working on and found I couldn’t load the site using Edge. The site loaded as expected in Chrome and IE but wouldn’t work for Edge, after few seconds I saw this lovely error screen.

After some searching I found this thread on TechNet which revealed that we need to add an loopback exemption for Edge, or Spartan, depending on which build of Windows 10 you’re running.

CheckNetIsolation LoopbackExempt -a -n=microsoft.microsoftedge_8wekyb3d8bbwe
CheckNetIsolation LoopbackExempt -a -n=microsoft.windows.spartan_cw5n1h2txyewy

You may also need to open a new tab after adding the exemption in order to successfully browse to you locally hosted website.

What about that package name used in the command used?
Well, take a look under C:\Windows\SystemApps and you can see the full package name listed there. I would imagine that if you wind up building your own apps that require access to localhost then you’ll need to add specific exemptions that use the full name of the app package.