Windows Store App connection to local network not working without fiddler

Hello,

I wanted to test my Windows Store App on a surface pro. The App connects to an REST Service that runs on a local server.

I got the follow error: “An attempt was made to access a socket in a way forbidden by its access permissions 192.168.0.100:80”.

The app can access the service when fiddler runs and can access internet resources with and without fiddler running.

I was confused about this issue. But when you think about what fiddler does, the problem is clear.

Fiddler acts as a proxy and the application can not see where the traffic goes to.

The solution is to check the capability “Private Networks (Client & Server)”.

Windows Store Apps have 3 network capabilities.

- Internet (Client)

- Private Networks (Client & Server)

- Internet Client  & Server

I thought selecting Internet (Client) would include Private Networks ( Client & Server), but I was wrong.

If you want to connect to your local network and the internet, you have to check both capabilities.