Conexion con Internet desde app

[sfvgekko]

Pues basicamente hago todas las conexiones con esta clase, funciona perfectamente menos en los casos que comento, donde 2 maquinas conectan desde la misma red:

Código:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.json.JSONArray;
import android.app.Activity;
import android.os.AsyncTask;
import android.util.Log;

public class JSONActivity extends Activity {

	public String readJSONFeed(String URL) {
		
		StringBuilder stringBuilder = new StringBuilder();
		
		HttpGet httpGet = new HttpGet(URL);
		HttpParams httpParameters = new BasicHttpParams();
		int timeoutConnection = 7000;
		HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
		int timeoutSocket = 10000;
		HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
		DefaultHttpClient client = new DefaultHttpClient(httpParameters);
	    //HttpClient client = new DefaultHttpClient();
		
		try {
			HttpResponse response = client.execute(httpGet);
			StatusLine statusLine = response.getStatusLine();
			int statusCode = statusLine.getStatusCode();
			if (statusCode == 200) {
				HttpEntity entity = response.getEntity();
				InputStream content = entity.getContent();
				BufferedReader reader = new BufferedReader(new InputStreamReader(content));				
				String line;
				while ((line = reader.readLine()) != null) {
					stringBuilder.append(line);
				}
			} else {
				Log.e("JSON", "Failed to download file: " + URL);
			}
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return stringBuilder.toString();
	}
	
	public class ReadJSONFeedTask extends AsyncTask<String, Void, String> {
		
		JSONArray jsonArray;
		
		protected String doInBackground(String... urls) {
			return readJSONFeed(urls[0]);
		}
		
		protected void onPostExecute(String result) {
			try {
			
				
			} catch (Exception e){
				e.printStackTrace();
			}
		}
	}

	

}