SOAP uses HTTP with an XML payload. "405.0 - Method Not Allowed" usually indicates a URL + method combo that the web server doesn't like. You should be able to test this by going to said URL (proxy) yourself (your browser would use the GET method though, so in case the server treats GET and POST differently, you may want to use a command-line tool to test POST) and see if you have access. It doesn't look like this request gets past the HTTP access part, so the rest is probably not relevant yet.