About SocketException

Question

IOException2 in ClientThread is java.net.SocketException: Connection reset by pe
er: JVM_recv in socket input stream read,
this problem I dont understand,below is code,thank you
    public void run(){
      while(true){
         try{
           String message=read.readLine();
           if(message!=null && message.indexOf(".")==0){
              System.out.println("the received message is "+message);
              new testDriver(message);
         }catch(IOException e){
           System.out.println("IOException2 in ClientThread is "+e);
           System.exit(0);
    }

Answer 1

this problem now I solve,but another problem is coming;
another problem is:
when server is listenning:(the code below)
  int sPort=6633;
  ServerSocket sSocket=new ServerSocket(sPort);
  Socket cSocket=sSocket.accept();then how to close the connection in server?
by the way,how to close the connection in client as well?