TATAA!! Error is solved. Our developer found the problem. The Envox (.NET 1.1) is not compatible with Axis 1.1 or Axis 2.0 (strange!). This is a a problem with .NET, as envox mentioned. We had to rebuild the wsdl. Now it works. Sad but true, it has some serious disadvantages if a system like envox runs on windows. It would be great if envox could also deliver a linux solution. I am sure this would increase the performance and stability dramatically. Maybe envox will turn away from windows in future…