snc/accept_insecure_r3int_rfc is a SAP Parameter attribute which is used to control Accept insecure internal RFCs on SNC-enabled Server 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 .
This parameter allows you to accept RFC connections without SNC
encryption from the same SAP system with internal destinations (see
SM59), even if no insecure RFC connections are accepted because
parameter snc/accept_insecure_rfc = 0.
This parameter only has any effect if snc/accept_insecure_rfc = 0, since
otherwise insecure RFC connections are accepted anyway.
See also the discussion of this parameter in the security guide for
system administrators.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.