I already tried some different SOAP-messages, even one which has an empty header and body, but without success to get into my SoapHttpRouter-derived class :-(
Also, when I hit the .asmx-URL with the browser it comes to that error.. here detailed stack trace of the error:
[NotSupportedException: WSE003: The input was not a valid SOAP message.]
Microsoft.Web.Services2.Messaging.SoapHttpRouter.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object asyncState) +134
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8677954
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
I hope that someone is out there who had the same problem. I would appreciate your help very much!