RemotingException: Requested Service not found error

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.NET

IIS

WCF

.NET4

I have a web-site under IIS7 on Win7. Created a new WCF Service Application in Visual Studio 2010 under .NET 4.0. It works fine under ASP.NET Development server, but when I deploy my app to IIS and trying to access it via URL "http://localhost/MySite/Service1.svc" I have this error:

System.Runtime.Remoting.RemotingException: Requested Service not found

If I'm just trying to open site folder "http://localhost/MySite/" I have this error:

System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.Runtime.Remoting.Channels.Http.HttpChannelHelper.GetObjectUriFromRequestUri(String uri)
   at System.Runtime.Remoting.Channels.Http.HttpRemotingHandler.CanServiceRequest(HttpContext context)
   at System.Runtime.Remoting.Channels.Http.HttpRemotingHandler.InternalProcessRequest(HttpContext context)

There is a default.aspx also in this folder and i can open it successfully by direct link "http://localhost/MySite/default.aspx" but it is not opened as default document.

No stack trace, no errors in Windows App or System log. I've tried to enable tracing in web.config - nothing.

The web.config is:

<?xml version="1.0"?>
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0" />
  </system.web>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
 <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>
</configuration>

While researching this problem I've found that error occures even before IIS actually starts my service. I changed my .svc file to have "ServiceLost" instead of "ServiceHost" tag, but error remains the same.

I assume that error source is somewhere in .NET assemblies. But where?!