Microsoft Edge localhost loopback setting doesn't work

Question

_{Wednesday, August 31, 2016 2:47 PM}

Hello!

Seems the checkbox "Allow localhost loopback" doesn't work.

Now I have tried to open the local website (running on IIS 10) in Edge browser. But got page couldn't be loaded. In other browser it works fine.

I read about some issues with disabled localhost loopback in Edge and tried to enable it in about:flags page. But it didn't help.

Then I added exclusion for Edge with CMD command:

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

And now all works fine in Edge! Even when I disable loopback in about:flags page.

So seems, this checkbox doesn't work and doesn't affect on allowing localhost loopback at all.

Tested on windows 10 build 1511 and 1607

All replies (4)

_{Thursday, September 1, 2016 6:54 AM ✅Answered}

Hi bam0o,

According to my test, the checkbox "Allow localhost loopback" will modify the following registry key.
[HKEY_CURRENT_USER\SOFTWARE\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoft.microsoftedge_8wekyb3d8bbwe\MicrosoftEdge\ExperimentalFeatures]
AllowLocalhostLoopback
I am not sure why it won`t work.

Anyway, I am glad the "CheckNetIsolation LoopbackExempt -a -n="Microsoft.MicrosoftEdge_8wekyb3d8bbwe"" could work.
For the specific issue, I hope the following link will be helpful.
How to debug localhost on Microsoft Edge
https://blogs.msdn.microsoft.com/msgulfcommunity/2015/07/01/how-to-debug-localhost-on-microsoft-edge/

Best regards

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_{Friday, September 16, 2016 2:39 AM}

CheckNetIsolation LoopbackExempt -a -n="Microsoft.MicrosoftEdge_8wekyb3d8bbwe did not work for me.

Neither did the "Allow localhost loopback" checkbox.

If I go to Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoft.microsoftedge_8wekyb3d8bbwe\MicrosoftEdge\ExperimentalFeatures]

what should I see?

Thanks.

_{Friday, September 16, 2016 9:47 AM}

I can't check registry now.

But before using checknetisolation I found another solution: I opened Internet properties (options or something similar in IE menu) and worked around with intranet zone. There are three or so checkboxes and I tried their combinations... With some of it all worked fine with localhost

I mean this window. Sadly I don't remember what combination was working for me...

_{Wednesday, December 7, 2016 3:08 PM}

Now it works (by default) in 38.14393.0.0 under Windows 10 Pro 14393.447**.**

But it does not work for 10 Enterprise 14393.447**.**

https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/10082889/