ServerSocket mainServerSocket=null;
Socket mainSocket=null;

mainServerSocket = new ServerSocket(52834);
mainServerSocket.setSoTimeout(5000);
mainSocket = mainServerSocket.accept();
===================================================
SocketTimeoutException sijaan tulee:

java.io.IOException: Internal error: _javanet_accept():
   at gnu.java.net.PlainSocketImpl.accept (Native Method)
   at java.net.ServerSocket.implAccept (ServerSocket.java:370)
   at java.net.ServerSocket.accept (ServerSocket.java:325)
   at ClientX.main (ClientX.java:102)