[LoadUIWeb] Parameterized value is not getting assigned

It's deep night for Mike right now. He will be able to reply tomorrow only.

Closed connection generally means some error on the server side. You may have a number of errors on the server side and it not always may respond correctly. So i suggesting you to inspect response headers and body of your server. You can store response data in log via turning on appropriate option or just verify scenario to see real server response in log.