Turn off HTTP KeepAlive

NoHttpKeepAlive.cs

// When testing in an NLB environment, it's helpful to test 
// with a WCF client which doesn't reuse open TCP connections
// for HTTP...

var bindingElements = wcfBinding.CreateBindingElements();
var httpBe = bindingElements.OfType<HttpTransportBindingElement>().FirstOrDefault();
if (httpBe != null)
{
   httpBe.KeepAliveEnabled = false;
}