I'm supporting code that has been using the SnmpTarget.snmpGetBulkVariableBindings method for years in a large network with no problem.  Suddenly, and only on a few devices, when querying the Ciena wwpLeosCfmServiceTable MIB(.1.3.6.1.4.1.6141.2.60.35.1.2.1) I get the following:

SNMP Target ErrorCode: 50

Error String: SNMP ASN1Error encountered due to Illegal SNMP packet received from 10.252.24.33

Error Index : 0

Error Exception: 0

The only reference to the ASN1Error I can find(below) doesn't seem to apply because I'm using SNMPv1

- Fix provided so that the 'SNMP ASN1Error encountered due to IllegalSNMP packet received' error is not thrown if the received SNMPV3 PDU data size is greater than 65535 bytes. 

Also, when this error is received sometimes I get all the data I needed from the table anyway.  Other times only the indexes and one of the service types are returned.  It's very odd. 

When polling the device directly with a MIB browser using v1 I always get the whole table with no errors.

Any help will be appreciated.