Rails v1.2.3, ActionWebService and .NET platform as client

Question

I'm using Rails 1.2.3 on a project. ( Upgrading rails is not an option ). I've created a simple test web-service using Rails. I've tested using the Rails invoke scaffold. It seems to generate the response with no problems.

I'm trying to setup a client via .NET. I've created an ASP.NET Web App project in C#. I am adding a "Web Reference", add the Reference URL into the URL field of the wizard,

http://mydomain.com:3000/backend/api

then I receive an error from the wizard:

There was an error downloading 'http://mydomain.com:3000/backend/api' The request failed with the error message:

GET not supported

There was an error downloading 'http://mydomain.com:3000/backend/api/$metadata' The request failed with the error message:

GET not supported

My code is:

# in app/apis/address_api.rb
class AddressApi < ActionWebService::API::Base
   api_method   :gettest, :returns => [:string]
end

# in app/controllers/backend_controller
class BackendController < ApplicationController
  wsdl_service_name 'Backend'
  web_service_api AddressApi
  web_service_scaffold :invoke

  def gettest
    return "hello"
  end

end

Are there any known issues between ActionWebService and .NET or am I doing something wrong? Is my URL correct for a rails web-service?