Developing with DiskExtender SDK - DxServiceLogOnEx problems

Hello, i´m currently developing in VB6 with the DiskExtender SDK. In my development machine everything goes wright but when o try to run the app in production server i get the following error - RPC Server is unavailable error code: 1722. This seems to happen when the app reaches the DxServiceLogOnEx function. There are to parametres there, ProtocolType and EndPoint that suggests a previous configuration to run correctly, but I tryed all possible and still get that error.
Can anyone help please?

Thank you.