I'm working on UWP app on my laptop. On a previous laptop with a pre-release Windows 10, I was able to get my app to see my web API service on localhost, but on this laptop, no matter what I try, I always get this error using HTTP client:
A connection with the server could not be established
var response = await client.GetAsync(BuildGetRequest()).AsTask(source.Token);
If I point to my published service on Azure, everything works fine. Here's what I have tried:
Nothing makes any difference.
I have noticed that I'm having a similar problem in Edge, despite allowing Localhost loopback in about:flags
and several other suggestions I found at:
My Web API project runs fine in every browser except Edge, so I'm guessing as Edge is a universal app, the problem is linked. When I debug it in Edge, I get this error:
Can't connect to the proxy server
If I go to Settings
and switch off the manual proxy server, run it again I get:
Hmm, we can't reach this page
I notice though that for some reason the Manual Proxy server setting keeps switching back on during subsequent runs.
Could anyone suggest anything else I could try to get my UWP app to see my service on localhost?
It's not a bug it's a feature, called network isolation. It was introduced in Windows 8 (where Metro apps were called Windows Runtime apps).
For security reasons, a UWP app that is installed in the standard manner is not allowed to make network calls to the device it is installed on.
The feature can be disabled in Visual Studio debug settings, also the article How to allow loopback for Windows Runtime apps talks about using the CheckNetIsolation Windows tool to enable loopback access per application:
CheckNetIsolation.exe LoopbackExempt -s
CheckNetIsolation.exe LoopbackExempt –a –p=S-1-15-2-4125766819-3228448775-2449327860-2490758337-1264241865-3581724871-2122349299
There are also GUI tools such as Enable Loopback Utility andLoopback Exemption Manager which make this task easier:
It might be in the future with the project reunion .
https://github.com/microsoft/ProjectReunion/issues/113
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