Since the discontinuation of SNC version 1.0 (31.12.2017) and the introduction of SNC 2.0, the connection of SAP clients via SNC and Single Sign On (SSO) is only one option. It is now also possible to establish a secure connection using SNC and still require a user name/password combination.
This option is missing on the configuration page of the commissioning wizard. The setting must be passed on with another "RfcConfigParameters.SncSSO" (in the connection string "SNC_SSO"). If this parameter is not passed on (0=Login with user name/password; 1=SSO-Login (default)), the user name and password are ignored.
This is a product defect (32415).
This will be fixed on a future release of the product. If you require this immediately corrected, please contact support for a hotfix referencing the defect ID 32415.