SAP SICF WSDL11 and RFC

Hello Guys,

I have a question about SAP SICF -->Under SOAP we have WSDL11 and RFC which is activated.

I have a created a function module which is remotely enabled and I am able to get the WSDL11 for this function module

and call this web service and get results http://<server>:8000/sap/bc/soap/wsdl11?Service=functionmodulename

When I am trying to call  http://<server>:8000/sap/bc/soap/rfc I get error.

Internal Server Error

SOAPDOC:INIT CANNOT SET INOUT BUFFER

Is there anything we need to do in the settings?

what is the difference between both url's?

http://<server>:8000/sap/bc/soap/wsdl11?services=functionmodulename

http://<server>:8000/sap/bc/soap/rfc?services=functionmodulename

Please help.

Thanks,

James