After upgrading to NSM v2.5 an error started being reported each time the Janitor runs:

NSS<COMN>-3.2-696: dirQuotas.c[1142]
Unable to get used amount in dir quota, status=21501

It is an NSS error, but only started after going to NSM v2.5, never
saw the error before. So I am trying here first.

Netware 6.5sp7 / NSMENGIN 2.05 / NSMEVENT 2.05 / NSS 3.26