An error occurred while receiving the HTTP response to http://xx.xx.xx.xx:yy/AdvWebClient/CapacityManager. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details.
I replaced the ip and port numbers for security purposes.
I worked on this for almost a day, restarting the windows service, changing configuration, staring at trace logs, etc. Finally, as a last ditch effort, I rebooted the server and everything started working. Apparently, there was some kind of hang up in the http.sys that was preventing it from processing the traffic. This is despite the listeners opening and closing (I watched using netstat) when I started and stopped the service.
Hopefully this helps anyone else who encounters this problem. If anyone knows of a way to reset the http.sys system without rebooting the entire computer, please let me know. Thanks.