FTP server in java doesn't work well at win os in some status.Why?

As we know,FTP server in java used to use "BufferedOutputStream(socket.getOutputStream())" to complete data transfer.
socket.getOutputStream() returns SocketOutputStream, and SocketOutputStream use native method:socketWrite0 to transfer data.
I writted a FTP server in java that runs at win XP or win 2003 server. FTP client download file through internet,and when file size is large(for example, 5M),the download is failure. But I changed FTP server in C++,the download is ok. These PCs have multi network card commonly.
In the first instance,I thinked my programm may be written wrong. But I have used CrossFTP and DanoFTP at sourceforge.net, they failed too.
I have compared the source code of these FTP server and they are same in data transfer.
There are another strange phenomenon.FTP server at some PC works well. For example,when I install FTP server at another PC.So I think that it is not link problem,and may be relate with PC's configuration?
Any help appreciate.

Win XP(sp2) and win 2003 server all have happened. Version of JDK is 6u2. I have doubted with version of JDK, and I changed to JDK 6u10 but problem is same.
By the way, FTP server in C++ work well on these problem machine.
I think the problem is related with configuration of machine(hardware or software), but I want to know where and why.
Thanks for any help.

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