>The VFP version (the previous one) was build with ASP session cookie, no?

Yes, the previous version was making use of some new functionalities of Soap Client 3.0. One of them was the cookie state.

However, when I switched to a VB.NET environment to compile an ASP.NET Web Service, there I saw a brand new concept of building Web Service where I wouldn't go back now with another environment to build it.