Windows 8.1 Apps and Proxy Auto Configuration files

Question

We have installed an app on a number of Surface Pro devices for my client.  After installation, the app is unable to connect to the backend service.  The following details the configuration:
The apps are installed on Surface Pro 2 devices running Windows 8.1 Professional with an Enterprise Sideloading License
The devices are connected to the company's corporate domain wifi network.
The service is hosted on the same domain network
The network has a proxy configured via the following PAC file:
       function FindProxyForURL(url, host) {
　　　　　　// URLs within this network are accessed through
　　　　　 if (shExpMatch(url,"*checklistapp.uhs-pruitt.com/*"))　　　　　 {return "DIRECT";}
　　　　　 if (shExpMatch(url,"*asgs01.uhs-pruitt.com/*"))　　　　　 {return "DIRECT";}
　　　　　 // All other requests go through port 8080 of proxy.example.com.
　　　　　 // should that fail to respond, go directly to the WWW:
　　　　　 return "PROXY wsas360-01.uhs-pruitt.com:80; DIRECT";
The proxy requires authentication when not using a DIRECT connection
When using this PAC file, the app cannot connect to the service (which is at
https://checklistapp.uhs-pruitt.com/Service ), despite the fact that netsh shows that the app is using a direct (no-proxy) connection.
The app connot connect if last line of the PAC file is changed to
DIRECT; PROXY wsas360-01.uhs-pruitt.com:80
When hard coding the proxy (The url below is hosted at 10.100.255.250), the app is able to connect

Answer 1

Hi Ryan, 
If you use an Internet proxy server that requires authentication, you may encounter problems when you use apps that connect to the Internet. 
Please refer to following article to configure your settings: 
Using authenticated proxy servers together with Windows 8
http://support.microsoft.com/kb/2778122/en-us
Kate Li
TechNet Community Support