| UnsupportedSecLevels |
| The total number of packets received by the SNMP engine which were dropped because they requested a securityLevel that was unknown to the SNMP engine or otherwise unavailable. |
| NotInTimeWindows |
| The total number of packets received by the SNMP engine which were dropped because they appeared outside of the authoritative SNMP engine's window. |
| UnknownUserNames |
| The total number of packets received by the SNMP engine which were dropped because they referenced a user that was not known to the SNMP engine. |
| UnknownEngineIDs |
| The total number of packets received by the SNMP engine which were dropped because they referenced an snmpEngineID that was not known to the SNMP engine. |
| WrongDigests |
| The total number of packets received by the SNMP engine which were dropped because they didn't contain the expected digest value. |
| DecryptionErrors |
| The total number of packets received by the SNMP engine which were dropped because they could not be decrypted. |