If you have trouble logging on with SNC Client Encryption, check the following:

• The client user is logged on in the Windows domain.

• Check the service principal name entered in the Microsoft Active Directory server for the ABAP system.

  For more information, see Preparing the AS ABAP.

• In the user interface for SAP GUI for Windows client, check the service principal name and realm. The realm is case sensitive.

  For more information, see Configuring SAP GUI for Windows.

• Check that the environment variable SNC_LIB of the client host system is set to <Install_Path_SAP_GUI>\FrontEnd\SapGui\Encryption\secgss.dll

• Check the log files on the client and server host systems

• Enable the trace

  For more information, see Enabling Traces for SNC Client Encryption.