Change Web Service test page [wsdlHelpGenerator]
the default web service page is a page that reveals a lot of the internal information of the application, this is something that you want to hide.
Warning this does not really secure your web service. may be you should read something like this
<configuration>
<system.web>
<webServices>
<wsdlHelpGenerator href="yourEmptyPage.aspx"/>
</webServices>
</system.web>
</configuration>
just make sure you add a page to your site’s root folder and name it yourEmptyPage.aspx this way whenever someone navigates to your web services URL that page is going to render