Htpplistener not working via Lan!

Did you try with [server lan address]:[port] (port seems to be 8080)?

I am sharing codes:
Server side:

string[] prefixes = new string[] { "http://*:2999/" };
webserver = new WebServer(prefixes);

public class WebServer
{
private readonly HttpListener listener = new HttpListener();
internal HttpListenerContext context;
public WebServer(string[] prefixes)
{
if (!HttpListener.IsSupported)
throw new NotSupportedException(
"Needs Windows XP SP2, Server 2003 or later.");

if (prefixes == null || prefixes.Length == 0)
throw new ArgumentException("prefixes");


foreach (string s in prefixes)
listener.Prefixes.Add(s);

}

public void Run()
{
listener.Start();
context = listener.GetContext();
}
public byte[] GetDatas()
{
HttpListenerRequest request = context.Request;
byte[] gelenveriler = new byte[5000];
request.InputStream.Read(gelenveriler, 0, gelenveriler.Length);
request.InputStream.Close();
return gelenveriler;
}
public void SendDatas(byte[] veriler)
{
HttpListenerResponse response = context.Response;
response.ContentLength64 = veriler.Length;
response.OutputStream.Write(veriler, 0, veriler.Length);
response.OutputStream.Close();
}
public void Stop()
{
listener.Stop();
listener.Close();
}
}
}

Client:

String targetURL = "http://192.168.43.2:2999/";
HttpURLConnection connection = null;
try {
URL url;
//Create connection
url = new URL(targetURL );
connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("POST");
connection.setDoInput(true);
connection.setDoOutput(true);
Toast.makeText(getApplicationContext(), "Connection nesnesi ayarlandı.", Toast.LENGTH_LONG).show();





//Send request
DataOutputStream wr = new DataOutputStream (
connection.getOutputStream ());
File dosya = new File(xmlpath);
FileInputStream fis = new FileInputStream(dosya);
byte [] veriler = new byte[(int) dosya.length()];
fis.read(veriler);
Toast.makeText(getApplicationContext(), "Veriler Gönderiliyor", Toast.LENGTH_LONG).show();
wr.write(veriler);
wr.flush ();
fis.close();
wr.close ();

//Get Response
InputStream is = connection.getInputStream();
byte [] gelenler = new byte[10000*5000];
int size = is.read(gelenler);
byte[] sonuc = new byte[size];
for (int sayac = 0; sayac < size ; sayac++) {
sonuc[sayac] = gelenler[sayac];
}
File gelendosya = new File(Environment.getExternalStorageDirectory().getPath() + "/otoq/result.html");
FileOutputStream fos = new FileOutputStream(gelendosya);
fos.write(sonuc);
fos.close();
is.close();

} catch (Exception e) {

Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();

} finally {

if(connection != null) {
connection.disconnect();
}
}