Monitoring and Debugging SAPServer Stubs 

Use

In RFC server code you can set a breakpoint directly in the C# class and see when the function is called by the SAP system. You can monitor TRFC calls to your server from the TRFC monitor in the SAP system with transaction SM58. From here you can also resend the function call to your server. Use the SAP queue monitor (transaction SMQ2)to monitor QRFC calls.

You can do advanced tracing within the SAP system, for example from transaction code SM50 and by examining the work process trace files (for example, dev_w0 in the SAP work directory).