Set this parameter to display the logon screen even if SNC is enabled.
If you set this parameter to the value 1, the system displays the logon screen for every logon, even if the communication is secured with SNC.
Otherwise, if the system can uniquely map the SNC or external name from the logon request to a single user in the SAP system, then it does not display the logon screen. (The user with the given SNC or external name must exist in the SAP system once and in only one client.)
0 (the logon screen is only displayed if necessary)
snc/enable (activate SNC)
0 : The logon screen is displayed only when necessary
1 : The logon screen is always displayed