continuously get error on big file

[jiayiyaij]

Hi there,
I'm transferring a file larger than 15GB, in the client's output it continuously output this line:
wdt transfer progress 0.00 Mbytes, completed 0%, Average throughput 0.00 Mbytes/s, Recent throughput 0.00 Mbytes/s 0 Files discovered (complete)

on the server side, got some errors like:

WdtSocket.cpp:208] wdt>   Unable to read tag, got 0 needed 16 0x00000000000000000000000000000000
WdtSocket.cpp:617] wdt>   Unable to read tag at the end of stream 34347

It happens sometimes even on small files.
I'm testing it by using devserver(fb's)

Any idea?
Thanks