Thanks for the reply. That makes sense. However, in this case, I am not going through a proxy. For the test harness, I am going directly against the IP address of the web server - which is on the same network as my test harness.

The odd thing is that in our custom app (which is a windows service), I haven't observed this behavior. It makes multiple subsequent web service calls without an exception. I'll step through the code more this weekend, but for now, I'm just trying to get my test app standing up and calling all the web service methods we use in the windows service.

For now, I'll just keep using the inherited class with KeepAlives off. I was just wondering if the problem was something obvious.

Thanks again!