Getting AccessDenied Exception when calling the Socket.ConnectAsync(socketEventArg)

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C#

UWP

Hi fellow programmers,

I am new to UWP so would like to thank you in advance for helping me on this issue.

I am following this MSDN article of "How to create and use a TCP socket client app for Windows Phone 8" https://msdn.microsoft.com/en-us/library/windows/apps/hh202858(v=vs.105).aspx[^]
in VS 2015 to test how the

System.Net.Sockets.Socket

Class works in UWP app.

I basically ported the whole project into an UWP application and it works as expected with the built-in Simple TCP/IP Services on my computer.

However, as soon as I changed the IP and port number to an existing TCP socket server on my LAN (IP: 192.168.200.254, Port: 2223) I get AccessDenied Exception on connecting.

Here is the code for Connect():

public string Connect(string hostName, int portNumber)
       {
           string result = string.Empty;

           // Create DnsEndPoint. The hostName and port are passed in to this method.
           DnsEndPoint hostEntry = new DnsEndPoint(hostName, portNumber);

           // Create a stream-based, TCP socket using the InterNetwork Address Family.
           _socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);


           // Create a SocketAsyncEventArgs object to be used in the connection request
           SocketAsyncEventArgs socketEventArg = new SocketAsyncEventArgs();
           socketEventArg.RemoteEndPoint =  hostEntry;

           // Inline event handler for the Completed event.
           // Note: This event handler was implemented inline in order to make this method self-contained.
           socketEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(delegate (object s, SocketAsyncEventArgs e)
           {
               // Retrieve the result of this request
               result = e.SocketError.ToString();

               // Signal that the request is complete, unblocking the UI thread
               _clientDone.Set();
           });

           // Sets the state of the event to nonsignaled, causing threads to block
           _clientDone.Reset();

           // Make an asynchronous Connect request over the socket
           _socket.ConnectAsync(socketEventArg);

           // Block the UI thread for a maximum of TIMEOUT_MILLISECONDS milliseconds.
           // If no response comes back within this time then proceed
           _clientDone.WaitOne(TIMEOUT_MILLISECONDS);

           return result;
       }

I tried different non-existence ip and ports, always get the same exception. So looks like a client side issue. The call has never got to the server.

Do I need to do any additional settings on my client side code?

There is another issue when porting this code to UWP:
The Socket.Close() method is no longer there!?
The closest is ShutDown().

Is this ShutDown() supposed to be the replacement?

Kind regards.