?
Basically the error message is saying that the client (it appears, your web browser) cancelled the request halfway through completing it. You can reproduce it by, like requesting the URl and quickly closing the browser, or hitting back button, or something. It could also be intermediate equipment that cancelled the request, too.
Basically the error means that the response could not be sent because the server can no longer talk to the client(browser). There's no other information that the web server (IIS, in this case) can know.
It's not uncommon for a loadbalancer to do this, and you can generally ignore this error in the diagnostic center.
