For SNC connections to be possible with SAProuter, SAProuter must be started with this option:

saprouter -r -K <mysncname> (IBM i: saprouter '-r -K <mysncname>').

There must also be a KT entry in the Route Permission Table specifying that connections with a certain host (whose SNC name is known) should be SNC connections. <mysncname> is the SNC name of the host on which the SAProuter is running.