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Step-by-Step Guide for Implementing SAP SNC (Secure Network Communications)

 What is SNC?

SAP Secure Network Communications (SNC) provides application-level, end-to-end security between the SAP GUI and the SAP application server. By enabling SNC, you can ensure that data is encrypted and protected during transmission, providing three levels of security: authentication, encryption, and integrity.

This guide outlines the steps to enable SNC through Windows Active Directory (AD).

Step-by-Step Guide for Implementing SNC:

1. Create a User in Windows AD

  • Create a new user in Windows Active Directory (e.g., SNCuser).

2. Set Service Principal Name (SPN) for the User

  • Set the SPN using ADSI Editor (e.g., SAP/SNCuser).

3. Set Subject Alternative Name (SAN) and User Principal Name (UPN)

  • Configure the SAN & UPN as SNCuser in ADSI Editor.

4. Set Environment Variable on Server Side

  • Set the SECUDIR environment variable on the server side:
    SECUDIR=\usr\sap\sid\DVEBMGS00\sec.

5. Download SAPCRYPTOLIB from SAP Marketplace

  • Download the SAPCRYPTOLIB package from SAP Marketplace for the server side.

6. Extract SAPCRYPTOLIB using SAPCAR

  • Use the command sapcar -xvf *.* to extract the package to the folder \usr\sap\sid\DVEBMGS00\sec.

7. Open Command Prompt in the Same Folder

  • Navigate to the folder where the SAPCRYPTOLIB was extracted.

8. Generate PSE File Using sapgenpse

  • Run the following command to generate the PSE (Personal Security Environment) file:
    shell
    sapgenpse keytab -p SAPSNCSKERB.pse -x <password_for_PSE> -X <password_for_SNCuser@DOMAIN.COM> -a

9. Set Up Security Login for SNC

  • Execute the following command to set up the SNC security login:
    shell
    sapgenpse seclogin -p SAPSNCSKERB.pse -x <PSE_password> -O SNCuser

10. Configure SNC Parameters in RZ10

  • Access transaction code RZ10 in the SAP system to configure SNC parameters.

11. Set SNC Identity

  • Set the SNC identity as:
    SNC/identify as= SNCuser@DOMAIN.COM.

12. Restart the SAP Instance

  • Restart the SAP system instance to apply the SNC configuration.

13. Download SNC Client Encryption 2.0 for End User

  • If the end user's SAP GUI does not support SNC, download the SNC Client Encryption 2.0 from SAP Marketplace.

14. Configure SNC in the End User’s SAP GUI

  • In the end user's SAP GUI, configure SNC settings.

15. Set SNC Name in the End User’s SAP GUI

  • Set the SNC name as:
    CN=SAP/SNCuser@DOMAIN.COM.

16. Set Maximum Available Settings

  • Configure the maximum available settings in the SAP GUI for optimal performance.

17. Click on SNC Logon (without Single Sign-On)

  • Select the SNC login method, ensuring it does not use Single Sign-On (SSO).

18. Complete the Configuration

  • Click “Finish” to complete the SNC setup in the SAP GUI.

19. Test the SNC Connection

  • Try logging into the system using the SAP GUI with your ID/password.
  • You should now see that SNC is enabled in your GUI session.

Conclusion: Enabling SAP SNC ensures that your SAP environment is secured with encryption, authentication, and integrity, minimizing the risk of data breaches and ensuring safe communication between clients and the server. By following the steps outlined above, you can easily implement SNC and enhance the security of your SAP systems.

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