sapstartsrv cannot be stopped with sapcontrol

Hi,

I am running a lot of SAP instances and i am writing start/stop scripts. When starting a Netweaver 7.0 instance (command: startsap) it automatically starts sapstartsrv (for java MMC functionality). When i stop the sap system (command: stopsap) it does not stop this service. You can stop this by using the following command:

sapcontrol -nr 00 -prot NI_HTTP -function StopService

However, this results in an error message:

StopService

FAIL: Method 'SOAP-ENV:Envelope' not implemented: method name or namespace not recognized

Does anybody have a clue what goes wrong?