Did you find something like this in your docs:

"Windows NT implements SNMP as a service. Any iPlanet servers that use SNMP communicate directly with this service. iPlanet Administration Server does not perform any SNMP-related tasks on Windows NT. All SNMP-related tasks are handled by the operating system."

What I guess I take from that is that the iPlanet Admin server isn't used for SNMP config or mediation on NT. Not sure if that helps at all, but...