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We've created a webservice using .Net 2003. We got a report from a consumer
of the service and did some work to trace down the problem.

To reproduce, I created a VB desktop client with a single button that
invokes the service. The webservice object is created and set to nothing
when the button is clicked. The first time the service is invoked, it works,
and any immediate usage as well. If the application sits for, say, 10
minutes and the service is invoked again, it does not work. It hangs and
finally times out ("The underlying connection was closed: An unexpected
error occurred on a receive."). After that happens, the service works again.

Any ideas what might be going wrong? Thanks!