The server cannot write to the client. Why?

[wysota]

void Thread::run(){
QTcpSocket sock;
sock.setSocketDescriptor(socketDescriptor);
while(1){
  QByteArray ba("test\n");
  sock.write(ba);
  sock.waitForBytesWritten(1000);
  sleep(2);
}
}

void Thread::run(){
QTcpSocket sock;
sock.setSocketDescriptor(socketDescriptor);
while(1){
  QByteArray ba("test\n");
  sock.write(ba);
  sock.waitForBytesWritten(1000);
  sleep(2);
}
}

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