Hello all,

We have web service (v1.1 & WSE 2 sp 3) that is called by a web site.
Everything works fine on dev and uat however on live the following error
message appears:

[InvalidOperationException: Client found response content type of '', but
expected 'text/xml'.
]
 
System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage
message, WebResponse response, Stream responseStream, Boolean asyncCall) +1486
  System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String
methodName, Object[] parameters) +217
  MediationWeb.RegistrationSvc.RegistrationSvcWse.Login(LoginRequest
LoginRequest) +48
  MediationWeb._default.btnLogin_Click(Object sender, EventArgs e) +142
  System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108
 
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57
  System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler
sourceControl, String eventArgument) +18
  System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33

This appears in the event log:

Event Type:    Error
Event Source:    Microsoft WSE 2.0
Event Category:    None
Event ID:    0
Date:        05/02/2007
Time:        12:46:37
User:        N/A
Computer:    computer
Description:
System.NullReferenceException: Object reference not set to an instance of an
object.
  at
Microsoft.Web.Services2.WebServicesExtension.AfterSerializeServer(SoapServerMessage message)


And there is a internal server error 500 in the IIS logs.

The call is quite basic:

Web site:

            RegistrationSvc.LoginRequest LoginRequest = new
RegistrationSvc.LoginRequest();
            LoginRequest.Username = txtUsername.Text;
            LoginRequest.HashedPassword = HashedPassword;

            RegistrationSvc.RegistrationSvcWse RegSvc = new
RegistrationSvc.RegistrationSvcWse();
            RegistrationSvc.LoginResponse LoginResponse = RegSvc.Login(LoginRequest);


Web service:

       [WebMethod]        
       [return: XmlElement("UsernameExistsResponse")]
       public Messages.UsernameExistsResponse UsernameExists(
           [XmlElement("UsernameExistsRequest")]
           Messages.UsernameExistsRequest request)
       {            
            try
            {
                // create response message
                Messages.UsernameExistsResponse response = new
Messages.UsernameExistsResponse();
                response.Username = request.Username;
                // execute sproc

                DataAccess.usp_User_SelectByUsername sp = new
MediationRegistrationSvc.DataAccess.usp_User_SelectByUsername();
                sp.UsernameValue = request.Username;

                using(IDataReader dr = Database.ExecuteReader(sp))
                {
                    response.Exists = dr.Read();          
                    dr.Close();
                }
               
                // return response
                return response;
            }
            catch(Exception exc)
            {
                bool rethrow = ExceptionPolicy.HandleException(exc, "General");
                if (rethrow)
                    throw exc;
                throw new RoiRegistrationException(exc.Message);
            }
       }


The web.config on the web site and web service contains this:

   <webServices>
     <soapExtensionTypes>
       <add type="Microsoft.Web.Services2.WebServicesExtension,
Microsoft.Web.Services2, Version=2.0.0.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35" priority="1" group="0" />
     </soapExtensionTypes>
   </webServices>


Any help would be much appreciated.

Thanks

Sidharth