Unable to read data from transport connection

[Rich]

I have an application that connects to a web server and download
information.

This application worked and has not been changed in 2 years.

There are three phases to the application connecting to the web
server.

Phase 1 allows the customer to send a request and it returns XML data
that contains lists of Names that they can select to download

Phase 2 after the user has selected the Names a request is sent to
download the documents with those names. The data again is XML

Phase 3 allows a user to upload the changes they made to the documents
back to the web server. XML is also used to transport the data.

A new user recently installed the application and can not do phase 2
or 3 and they get the error "Unable to read data from transport
connection"

Since Phase 1 connects to the web server to download XML data and
Phase 2 does the same thing, I am confused as to why this is
happening. I am assuming that it has something to do with his network
configuration. None of our other customer have ever received an error
like this.

Can anyone tell me some reasons why the HTTPWebRequest would fail?
The only difference in Phase 2 and 3 is that they use the POST method
to send the data.

Thank you,

Rich

 

[Guest]

That error message is a generic Windows socket error which essentially means
that; there was a connection but now their isn't and I am trying to read from
a broken connection.

What type of connectivity does the user have and what is the difference
between phase 1 and phase 2 in terms of data load at any one time?