Java APIs

Hi,

I use this code to connecto my server from my Client

		if (socket == null){
			try{
				if (pwd.length > 0)
				{				
					System.out.println("opening connection...to "+host+" at port "+port);
					socket = new Socket(host, port);		
					toServer = new ObjectOutputStream(socket.getOutputStream());
					fromServer = new ObjectInputStream(socket.getInputStream());
					System.out.println("Connection established!");
					fireClientEvent(new ClientEvent(this, ClientEvent.CONNECTION_ESTABLISHED, ""));
					this.connected = true;
					Hashtable<String, String> table = new Hashtable<String, String>();
					table.put("action", "login");
					table.put("key", convertToString(pwd));
					sendObject(table);
				}
			}catch(IOException e){
				try{
					if (socket != null)
						socket.close();
					System.out.println("Error while connecting... Server does not exist!");
					this.connected = false;					
					fireClientEvent(new ClientEvent(this, ClientEvent.SERVER_DOES_NOT_EXIST, getHost()+":"+getPort()));
				}catch(IOException x){
					System.out.println("I/O ERROR @ CLIENT CONNECT!");
					removeAllListeners();
					x.printStackTrace();
				}
			}
		}

And this is how my server responds to client requests:

	public void run()
	{
		ServerSocket server = null;
		Socket socket 		= null;
		Hashtable<String, String> ClientInfo = new Hashtable<String, String>();  

		try{
			server = new ServerSocket(getPort());
			//listen for connections
			while (!stopServer)
			{
				try{
					System.out.println("Starting Server at port: "+getPort());
					socket = server.accept();
					ClientInfo.put("remoteip", socket.getInetAddress().toString());
					fireServerEvent(new ServerEvent(ClientInfo, ServerEvent.CONNECTION_REQUESTED, null));
					ThreadedSocket tsocket = getThreadedSocket(socket);
					tsocket.addSocketListener(this);
					tsocket.setMaxSolvingTime(maxSolvingTime);
					Sockets.add(tsocket);
					executor.execute(tsocket);
					fireServerEvent(new ServerEvent(ClientInfo, ServerEvent.CONNECTION_ESTABLISHED, null));
				}catch (IOException ioe){
					fireServerEvent(new ServerEvent(ClientInfo, ServerEvent.UNEXPECTED_CONNECTION_ERROR, null));
					exceptionThrown(ioe);
				}
			}
		}catch(Exception x){
			exceptionThrown(x);
		}finally{
			try{
				server.close();
				socket.close();
			}catch (Exception e){
				exceptionThrown(e);
			}
		}		
	}

It seems that after some time (aprox. 10-15 minutes) being idle, my client gets disconnected withougt firing any event so the Server thinks the client is still connected but it does not get any messages because the client has closed the connection (I think)

Am I doing/thinking something wrong?