UWP Apps Bypass the Proxy: The Loopback Fix

Store-installed apps — new Bing, Store editions of chat clients, Xbox app — carry a Windows restriction: they may not connect to the 127.0.0.1 loopback address. Your system proxy lives at exactly 127.0.0.1:7897, so UWP apps either go direct or lose connectivity entirely.

Option 1: the built-in UWP tool

1. Settings → find the UWP Tool entry (it requests elevation);
2. Tick the UWP apps that need network access through the proxy;
3. Save and exit — effective immediately, no reboot.

Option 2: command line

List all UWP containers in an elevated PowerShell:

CheckNetIsolation.exe LoopbackExempt -s

Exempt one app (Store Edge shown; -n takes the package family name):

CheckNetIsolation.exe LoopbackExempt -a -n="Microsoft.MicrosoftEdge.Stable_8wekyb3d8bbwe"

Microsoft's EnableLoopback Utility offers the same thing with a GUI if you prefer.

Option 3: just use TUN

TUN mode captures packets at the adapter, below the loopback restriction — the problem simply doesn't exist there. If TUN is your daily driver anyway, skip the exemptions; they only matter for system-proxy users.