An exception of this type may be thrown by a send( ) or receive( ) call on a DatagramSocket if the connect( ) method of that socket has been called, and if the connection attempt resulted in an ICMP "port unreachable" message.

Figure 12-15. java.net.PortUnreachableException

public class PortUnreachableException extends SocketException {
// Public Constructors
     public PortUnreachableException( );  
     public PortUnreachableException(String msg);  
}