Communication Paths that Support SNC

In this section, we provide an overview of the communication paths you can protect with SNC (see the figure below).

SAP System Communication Paths

The following system components are involved in the SAP system communication schema:

SAP GUI for Windows

Application Server for ABAP (AS ABAP)

Application Server for Java (AS Java)

External RFC programs

External CPIC programs

SAPlpd

SAProuter

The communication paths that result are shown in the table below.

SAP System Communication Paths

From → To	Using	See
SAP GUI for Windows → AS ABAP	Dialog / RFC	Configuring SNC: SAP GUI → AS ABAP
External program → AS ABAP	RFC	Configuring SNC: External Programs → AS ABAP Using RFC
External program → AS ABAP	CPIC	Configuring SNC: External Programs → AS ABAP Using CPIC
AS ABAP → AS ABAP	RFC	Configuring SNC: Using RFC from AS ABAP
AS ABAP → AS ABAP	CPIC	Configuring SNC: Using CPIC from AS ABAP
AS ABAP → External program (running on an application server)	RFC	RFC: TCP/IP Connection - Start an External Program on an AS ABAP
AS ABAP → External program (running on an explicit host)	RFC	RFC: TCP/IP Connection - Start an External Program on an Explicit Host
AS ABAP → External program (started over SAP GUI)	RFC	RFC: TCP/IP Connection - Start an External Program over SAP GUI
AS ABAP → External program (registered program)	RFC	RFC: TCP/IP Connection - Registered Program
AS ABAP → External program (started over a gateway)	CPIC	CPIC: Start an External Program over a Gateway
AS ABAP → External program (registered program)	CPIC	CPIC: Registered Program
AS ABAP → AS Java	RFC	RFC: TCP/IP Connection - Registered Program
AS Java → ASABAP	RFC	Configuring SNC: External Programs → AS ABAP Using RFC
AS ABAP → SAPlpd		Configuring SNC: Printing
SAProuter → SAProuter		Configuring SNC: SAProuter → SAProuter

For information about how to establish SNC protection for these connections, see Configuring the Communication Partners to Use SNC.

Note