Has anyone been getting these errors when serving up SQL Reporting Services Reports?

A connection that was expected to be kept alive was closed by the server

All of a sudden we have been getting a lot of these, and I am not sure at the moment what is causing them.

We have 2 webservers that are hosting the reportviewer control, which loads up reports from a single reporting server.

This guy suggested that this problem was related to some 10 minute timeout, but I haven’t been able to replicate his 10 minute problem.

Some other people are talking about overrideing the webservice proxy classes to set KeepAlive = false, but we have no webservice proxy to override as we are using the reportviewer.

Update:

This guy is talking about changing the SSRS session timeout.

Could “rc:Toolbar=false” be the problem?

Update 2:
Looks like this was all caused by the introduction of an IDP by our network guys.