StreamSocket.ConnectAsync arroja la excepción "HRESULT: 0x8007274C" al usar una VPN

the problem: While not using a VPN, the code below works fine. As soon as I connect to my home network via a VPN the, code throws an exception (translated from german):

A connection attempt failed because the connected party did not properly respond after a certain period of time, or established connection failed because connected host has failed to respond. (Exception from HRESULT: 0x8007274C).

The target "192.168.180.58" is an another computer within my home network.

Windows Store test code:

private async void createConnection(object sender, RoutedEventArgs e)
{
  HostName target = new HostName("192.168.180.58");
  string port = "8181";
  using (StreamSocket client = new StreamSocket())
  {
    try
    {
      await client.ConnectAsync(target, port);
    }
    catch (Exception ex)
    {
      string typeName = ex.GetType().Name;
      string msg = ex.Message;
    }
  }
}

I created a Windows Console Program (.NET 4.5.1) that is working in both situations (connected by using vpn and not using a vpn).

Windows Console test code:

namespace caPing
{
  class Program
  {
    static void Main(string[] args)
    {
      string target = "192.168.180.58";
      int port = 8181;

      TcpClient client = new TcpClient();
      try
      {
        client.Connect(target, port);
        client.Close();
      }
      catch (Exception ex)
      {
        Console.WriteLine(ex.Message);
        throw;
      }
    }
  }
}

It looks like that the problem is somehow related to the execution environment for Windows Store Apps (when using a vpn).

What is the problem here and how can I solve it?

Saludos cordiales,

Sörnt