usmStatsNotInTimeWindows
This is set when the engineTime specified is not within the timeWindow of agent. The engineTime is considered not within the timeWindow if any of the following is true.
This error is reported by the agent with its first varbind containing the OID ".1.3.6.1.6.3.15.1.1.2.0" and the value is a Counter giving the number of packets that have been dropped because of this error.