snc/permit_insecure_start is a SAP Parameter attribute which is used to control Permit to start insecure programs when SNC is enabled information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
If SNC is activated (parameter snc/enable = 1 ), by default no programs
that communicate without SNC are started by the gateway.
With snc/permit_insecure_start this is permitted.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.