The underlying connection was closed: An unexpected error occurred on a receive.

Hi everybody,
  a webservice web method is called from window service to update a database table.there is a huge    amount of data is inserted or updated into database but i get exception on service on try catch block "The underlying connection was closed: An unexpected error occurred on a receive".i don't know what is roung.i am using window server 2003 and dotnet 1.1.
i don't want to use any iis settings to remove this bug