Error In External SNMPD Agent

SNMP++/AGENT++
1

Dear Team,

In our SNMP Agent we are using external SNMPD agent on which following error is occuring. Due to this error our SNMP Agent is getting restart.

SNMP4 version : 2.7.4
AgentX version : 2.7.2

Please confirm what is root cause of below warnings and error and how to fix same in external SNMPD agent (from external SNMPD agent point of view)

Sending confirmed PDU GET[requestID=822778003, errorStatus=Success(0), errorIndex=0, VBS[1.3.6.1.4.1.193.126.3.35.1.1.1.1.3.11 = Null]] to target 127.0.0.1/3161 although transport mapping org.snmp4j.transport.DefaultUdpTransportMapping@419b94fd is not listening for a response
WARN 2025-04-03T22:55:07,732 [MessageDispatcher.11] org.snmp4j.Snmp - Received response that cannot be matched to any outstanding request, address=127.0.0.1/3161, requestID=192125380
WARN 2025-04-04T06:33:26,207 org.snmp4j.MessageDispatcherImpl - Sending confirmed PDU GET[requestID=0, errorStatus=Success(0), errorIndex=0, VBS[1.3.6.1.4.1.193.126.3.19.1.1.1.1.45.13 = Null]] to target 127.0.0.1/3161 although transport mapping org.snmp4j.transport.DefaultUdpTransportMapping@6672d4f7 is not listening for a response
ERROR 2025-04-04T06:33:26,216 [MessageDispatcher.2] org.snmp4j.MessageDispatcherImpl - java.util.ConcurrentModificationException

2
  1. To fix the warning, call Snmp.listen() before sending the first request PDU.
  2. The reported ERROR will not occur on SNMPJ4 3.x! You can avoid it by not modifying any listeners of the MessageDispatcherImpl while requests are being processed.

Why are you using such outdated (unsupported) SNMP4J and SNMP4J-AgentX versions?