The Service Access Facility (SAF) is a mechanism used to administer terminals, modems, ports, and Transport Layer Interface (TLI)-based network services. The SAF is implemented through the Service Access Controller (SAC), which is documented in sac(1) and administered using sacadm(1M). Ports are managed using pmadm(1M). The TLI listener (listen) is managed using nlsadmin(1M). If you are not using any network services that require TLI, and you do not have or use ports, terminals, or modems, you can safely disable SAF by removing or commenting out the entry for SAC in /etc/inittab following the minimization principle.