Unable to negotiate authoritative SNMP engine ID

I was unable to get getcmd response from cisco router in gns3, where as i was able to get reply from a juniper olive device. “No SNMP response received before timeout” is the reply. When i tried to capture the packets in wire shark, i found the report pdu from juniper device contains the authoritative engine id, where as from cisco device, it was missing. Python code which i am running (taken from the examples), is below:

from pysnmp.hlapi import *

errorIndication, errorStatus, errorIndex, varBinds = next(
    getCmd(SnmpEngine(),
           UsmUserData('noauthuser'),
           UdpTransportTarget(('10.205.96.1', 161)),
           ContextData(),
           ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0)))
)

if errorIndication:
    print(errorIndication)
elif errorStatus:
    print('%s at %s' % (errorStatus.prettyPrint(),
                        errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
else:
    for varBind in varBinds:
        print(' = '.join([x.prettyPrint() for x in varBind]))

So can anyone throw some light on why it happens so. When i tried to run the ‘get’ command on the said cisco device by using GetSnmp.exe from snmpsoft.com, i am getting the proper response. Only when using the above code, i was unable to get any response.

[etingof]

4.4.12 has been released on PyPI and GitHub.

[etingof]

I think commit c5cefab2cee5ae38d093743ef83a08641385b1cc should fix this issue. If you could test it before I release the entire thing - that would be helpful.