Create SAP Web Service with SAP .Net Connector in 5 minutes

Author: Dennis Wang / Microsoft / EAS /SAP

What is SAP .NET Connector

  • SAP product. Based on Microsoft .NET Technology
  • Interact with SAP via RFC/SOAP
  • Fully integrated with Visual Studio.NET
  • Managed Code
  • Generates C# Proxy Classes for any .NET application integrations
  • Supports RFC and SOAP
  • Supports qRFC, tRFC
  • Supports asynchronous SOAP calls
  • RFC client or RFC server


Feature of Web Service

  • It is ASP.Net Web Service
  • Hosted by IIS. Using HTTP protocol
  • Secure: SSL for connection. NTLM for authentication. Role base authorization.
  • Single sign via NTLM GSSAPI
  • Platform Neutral. Can be accessed via http protocol.
  • Strong versioning via XML Namespace

Steps to Create Web Service for RFC_Customer_Get

  • Create a C# project for ASP.Net Web Service
  • Generate SAP Proxy via SAP .Net Proxy Generator for RFC_Customer_Get
  • Open Proxy1.cs and change the following line
  • public void Rfc_Customer_Get(…) to public virtual void Rfc_Customer_Get (…)
  • Open Service1.asmx and do the following modification
  • public class Service1 : SAPProxy1
  • public override void Rfc_Customer_Get (…)
  • Add this code in this method
  • this.Connection = SAP.Connector.SAPConnectionPool.GetConnection (MyConnectionString);
  • base.Rfc_Customer_Get(Kunnr,Name1, ref Customer_T);
  • Compile the code and you have the web service for this RFC.

How SAP Single Sign On work under ASP.Net Web Service


Set up single sign on for web service

IIS Configuration

  • Disable anonymous access
  • Set up Windows Integrated Authentication

Web Service Configuration
Generate encrypted user name and password via aspnet_setreg.exe program. This value will then be set up in registry. Here we assume the user name is SAPCMDEV
Add the following line in Web.Config

<identity impersonate=”true” sername=”registry:HKLMSoftwareSapWebServiceIdentityASPNET_SETREG,sername”
password=”registry:HKLMSoftwareSapWebServiceIdentityASPNET_SETREG,password” /> 
GSS Library
  • Requires on the server where Web Service is located.
  • Copy the GSSNTLM.DLL to c:windowssystem32
  • If the GSSNTLM.DLL was copied to a folder other then within the environment search path, you need to add the following line in system environment SNC_LIB=”file pathGSSNTLM.dll”
  • Make sure to replace the gssapi32.dll with this GSSNTLM.dll if the old gssapi32.dll exists. The old gssapi32.dll does not work.
  • Create Entry in Table SNCSYSACL via SNC0
  • This table contains a list of trusted domain accounts or SNC.
  • Start SAP and run SNC0
  • Make sure to enable the RFC/CPIC/Ext ID options


  • Make sure all users who access SAP will have their User Accounts in USRACL or via SU01
  • Mapping external users into SAP users
  • Run SM30 and table VUSREXTID
  • Value: Work Area=NT.
  • Value: External ID = MYDomaindennisw
  • Program The Connection String with the following value:
  • SNC_MODE=1;
  • SNC_PARTNERNAME=”p:” + System.Security.Principal.WindowsIdentity.GetCurrent().Name; ‘ Web Service Process Account
  • EXTIDDATA=User.Identity.Name; ‘Caller credential


How does InfoPath 2003 connect to SAP?

  • Utilize SAP RFC and BAPI.
  • Generate RFC/BAPI proxy by using SAP .Net Connector
  • Create Web Service Wrapper around the proxy
  • Hosting/Publish the web service via WSDL
  • InfoPath Consume the web service
InfoPath 2003 SDK
–Available on under downloads
InfoPath 2003, Technical Webcasts, Technical White Papers, Development Guides
Visit for information on:
–SAP at Microsoft
–SAP .Net Connector
–Upcoming customer workshops

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