Web Service Call Returnd Blank Response

Web Service Call Returnd Blank Response

I have a ASP.NET web service and it's a data transfer service between
Client and Web service.
Sometime i notice that web service call returned blank response (No
exception in there). The Log file output is below (client side) (response
size showed in KB),
DEBUG 2013-09-03 10:01:49 – PerformSyncronization() Sent Message::6281.04KB
DEBUG 2013-09-03 10:03:14 – PerformSyncronization() Received Message::
00.00KB
Honestly i don't see this kind of behavior in my entire life.
Interesting thing is , there are no entry in the web service side for the
6281.04 KB data and there are no exception in Server side.
I think the data is unable to reach to the Web service from client side.
But you can see i got the blank response within Less then 2 minute and no
exception is thrown.
Why this is happening and Who are the responsible for this issue?