Be default Webservices are disabled. To enable the webservices you need add the follwoing settings in the web.Config file as given below.if you invoke the web services from remote server and you have not add the settings in web.config as given below then you get the following message "The test form is only available for requests from the local machine".
<webServices>
<protocols>
<add name="HttpGet"/>
<add name="HttpPost"/>
<add name="HttpPostLocalhost"/>
</protocols>
</webServices>