Set this parameter to specify that unprotected incoming CPIC connections on an SNC-enabled AS ABAP are to be accepted.
Per default, once SNC has been activated (snc/enable = 1), the AS ABAP rejects all incoming CPIC connections from external C programs or other SAP systems that are not protected with SNC.
Set this parameter (see Valid entries, formats) to override the default configuration and accept unprotected connections (for example, connections from existing CPIC programs, or from SAP systems that are not protected with SNC).
snc/enable (activate SNC)
0 : Reject unprotected connections
1 : Accept unprotected connections
U : Accept unprotected connections for those users who have the appropriate flag set in their user master record (see User Maintenance on AS ABAP).