Try this (I added another flush() between the "file" and "ack" packets):.

Qt Code: 
  1. #define TCP_MAXBUF            0x08000     // max TCP send and receive size buffer 32768  (MAX right now)
  2.  
  3. // Send File  
  4. do
  5. {
  6. //            read file pattly
  7.             qint64 bytesRead = vrFile->read((char *)buffer,TCP_MAXBUF);
  8.  
  9.             int sentSize = pFPSocket->write(fileBuffer.data(), bytesRead);
  10.             pFPSocket->flush();
  11.             if(!pFPSocket->waitForBytesWritten(Timeout))
  12.             {
  13.                theLog->WriteLog(QString("Wait for bytes written timed out"),LOG_LEVEL_ERR);
  14.             }
  15. }while(!vrFile->atEnd())  ; 
  16.         //flush the file packet
  17.           pFPSocket->flush();
  18. // Send Ack
  19.          QByteArray ackBuffer(7, 0);
  20.          QDataStream outAck(&ackBuffer, QIODevice::WriteOnly);
  21.  
  22.          outAck << (unsigned char)TCP_DISCONNECT;
  23.          outAck << (quint32)1;
  24.          outAck << (unsigned char)"¤";
  25.  
  26.          int i = sizeof(TCPPacket);
  27.          if(pFPSocket->write(ackBuffer.data(),6) < 6 )
  28.          {
  29.             // ERROR not total ack sent
  30.             theLog->WriteLog(QString("Could not store %1, complete ack not sent.").arg(Filename),LOG_LEVEL_ERR);
  31.             statusOK = false;
  32.          }
  33.  
  34.          pFPSocket->flush();
  35.          if(!pFPSocket->waitForBytesWritten(Timeout))
  36.          {
  37.              // ERROR not total ack sent
  38.             theLog->WriteLog(QString("Could not store %1, ack bytes not written.").arg(Filename),LOG_LEVEL_ERR);
  39.             statusOK = false;
  40.         }
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