Web Services testing WSDL -- can't reach service

[Claire]

I am setting up a test for a WSDL and receive the following error:The ping operation call failed.
The .NET Framework 2.0 WSE 3.0 toolkit returned the following error:
(null)
Line (8): "Set ping =

Code:

WebService("CalculationEnginePortService").ping(XMLWarehouse("inPing"))".

I used the Wizard to set up a simple ping test. I could access the server last Friday but can't this week. I searched your site and found this snippet:

Code:

Set ssr0XML = XMLUtil.CreateXMLFromFile("C:\sce.xsd")
XMLstr = ssr0XML.ToString
webService("CalculationEnginePortService").SendRequest "Ping", XMLstr

I tried this code and received a 500 internal error. What could possibly be wrong with the communication?

Thanks!!