WSE3.0 doesn't work with trust level="Medium" need help!

[Stu]

I x-posted this in the enhancements group as well, looking for some
help:

Need help with a CAS issue with WSE3.

Enable an asp.net2 webapp to use WSE3.
Create a new webservice in the app via Add New Item WebService

Alter code for webservice so the service inherits from SoapService,
instead of the defaults, like so: (this forces your service to use
WSE3)

using System;
using System.Web;
using System.Collecti ons;
using System.Web.Serv ices;
using System.Web.Serv ices.Protocols;
using Microsoft.Web.S ervices3;
using Microsoft.Web.S ervices3.Design ;
using Microsoft.Web.S ervices3.Messag ing;

/// <summary>
/// Summary description for TestService
/// </summary>
[WebService(Name space = "http://tempuri.org/")]
[WebServiceBindi ng(ConformsTo = WsiProfiles.Bas icProfile1_1)]
public class TestService : SoapService {

public TestService () {

//Uncomment the following line if using designed components
//InitializeCompo nent();
}

[WebMethod]
public string HelloWorld() {
return "Hello World";
}

}

Now attempt to call that HelloWorld method from the browser. works
fine, right?

Now edit the trust level for your IIS server to medium here:
c:\windows\..<l astest .net framework>\CONF IG\web.config

change ~line 23 to this:
<trust level="Medium" originUrl="" />

restart your IIS server via iisreset /restart

invoke your HelloWorld method again... you should get this error:
System.Security .SecurityExcept ion: That assembly does not allow
partially trusted callers.
at
System.Security .CodeAccessSecu rityEngine.Thro wSecurityExcept ion(Assembly
asm, PermissionSet granted, PermissionSet refused, RuntimeMethodHa ndle
rmh, SecurityAction action, Object demand, IPermission permThatFailed)
at TestService..ct or()

anyone have a clue to solve for this???

I added a StrongNameMembe rshipCondition into the web_mediumtrust .config
for WSE3 DLL, but this does not fix the situation!

any help would be appreciated!