Vista - Maximum size of Data stream for WSDualHttpbinding

Hi there.

I've created a Duplex service which is intended to read Data from a SQL
server database, convert the read data to a data contract and post the read
data to a Windows Forms client when all data is read. The amount of data can
be very large.
I already managed to receivee some data, but whenever the count of data
excedes a certain limit (which I haven't found out yet) I don't get data
anymore.

Annotation: I already tried sending the data as a DataSet, but the result
was the same.

My question is, is there any restriction in size of the serialized data that
WSDualHttpBinding support for trandfering data over the callback channel?

Many thanks