title: Socket Connection Timeout on Android Phone
body: <p>I'm trying to do some server/socket programming.  The server code is written in plain java on an Ubuntu machine.  The client code is written for my LG Thrill.  The server appears to work fine.  I've tested the server by writing a simple test client in plain java that basically uses the try/catch block with ip of "localhost".  I checked if the ip was reachable by ssh'ing into the server machine from my phone (yes, it's reachable).</p>
  
  <p>My server code looks like:</p>
  
  <pre><code>package org.vsector.server;
  
  import java.io.IOException;
  import java.net.ServerSocket;
  
  public class SceneFlowServer {
  
      int port;
      Thread running = null;
      CameraHandler handler = null;
  
      public SceneFlowServer( int port, CameraHandler handler ){
  
          this.port = port;
          this.handler = handler;
  
      }
  
      public void start(){
  
          if( handler == null ) return;
  
          try{
  
              running = new Thread(){
  
                  public void run(){
  
                      try{
  
                          ServerSocket listen = new ServerSocket( port );
                          while( true ){
  
                              System.out.print( "I am waiting on port " + port + "... " );
                              handler.accept( listen.accept() );
                              System.out.println( "Got someone!" );
                              Thread spinoff = new Thread( handler );
                              spinoff.start();
  
                          }
  
                      }catch( IOException e ){
  
                          System.err.println( "Could not listen on port " + port + "!" );
                          System.err.flush();
                          return;
  
                      }
  
                  }
  
              };
              running.start();
              running.join();
  
          }catch( Exception e ){
  
              System.err.println( "Could not start thread!" );
              System.err.flush();
  
          }
  
      }
  
  }
  </code></pre>
  
  <p>My CameraHandler code:</p>
  
  <pre><code>package org.vsector.server;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.net.Socket;
  
  public class CameraHandler implements Runnable {
  
      Socket client = null;
  
      public CameraHandler(){ }
  
      public void accept( Socket client ){
  
          this.client = client;
  
      }
  
      @Override
      public void run() {
          // TODO Auto-generated method stub
  
          BufferedReader in;
          try {
              in = new BufferedReader( new InputStreamReader( client.getInputStream() ));
              System.out.println( in.readLine() );
          } catch (IOException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          }
  
          try {
              client.close();
          } catch (IOException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          }
  
      }
  
  }
  </code></pre>
  
  <p>My client code looks like:</p>
  
  <pre><code>package org.vsector.client;
  
  import java.io.PrintWriter;
  import java.net.InetSocketAddress;
  import java.net.Socket;
  
  import android.app.Activity;
  import android.os.Bundle;
  import android.widget.TextView;
  
  public class ProcessingClientActivity extends Activity {
      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);
          TextView text = (TextView) findViewById( R.id.textBox );
  
          Socket sock;
          try {
              text.append( "\nOpening and writing to socket... " );
              sock = new Socket();
              sock.connect( new InetSocketAddress( "some ip", 4444 ), 30000 );
              PrintWriter out = new PrintWriter( sock.getOutputStream(), true );
              out.println( "Hello!" );
              out.close();
              sock.close();
              text.append( "Done!" );
          } catch (Exception e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
              text.append( "Error: " + e + "\n" );
              text.append( e.getMessage() );
          } 
  
      }
  }
  </code></pre>
  
  <p>Permission is set, but this still results in "Error: java.net.SocketTimeoutException: Connection timed out."</p>
  
  <p>I can't figure out what's causing it!  Any ideas?</p>
  
  <p>Edit:</p>
  
  <p>Nevermind.  Network issue.  I ran the code on my home network and everything works a-ok.</p>