Metro-style socket exception when sharing is enabled for the network

I am working on a Metro-style application that communicates with our server through a web service. In the beginning, I found that I need to add the features “Home or work network” (privateNetworkClientServer) and “Internet client” (Internet client) to the manifest, otherwise the application will throw exceptions when trying to make web service calls to a remote host.

Now, however, on some machines, I get the following socket exception when the application tries to call our web service:

System.ServiceModel.EndpointNotFoundException: There was no endpoint listening at https://[my_service_url] that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details. ---> System.Net.WebException: Unable to connect to the remote server
---> 
System.Net.Sockets.SocketException: An attempt was made to access a socket in a way forbidden by its access permissions [my_server_ip_address]:443
   at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
   at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, TransportContext& context)
   at System.ServiceModel.Channels.HttpOutput.WebRequestHttpOutput.GetOutputStreamAsyncResult.CompleteGetRequestStream(IAsyncResult result)
   --- End of inner exception stack trace ---
   at System.Runtime.AsyncResult.End[TAsyncResult](IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.SendAsyncResult.End(SendAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannelProxy.TaskCreator.<>c__DisplayClass5`1.<CreateGenericTask>b__4(IAsyncResult asyncResult)
   at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()

, ( wifi, " " ", " ), -. ( "" "" ), .

, , , . , , "/" "" ; - , "/" , "", , . ; Win8 .

, - - iframe, -.