snmpwalk fails with SHA/AES

Hi experts,

We have a SNMP manager(Zabbix) polling the host running snmp agent with net-snmp(5.8) on freebsd.

v3 user(azvision) has been configured on host with SHA/AES.

Following is snmpd.conf

# Copy this file to /mpsconfig, and make changes to /mpsconfig/snmpd.conf
# Changes in /etc/snmpd.conf will be lost following a reboot.
#
# The following are example for snmpd.conf.
#
#SNMP Trap Destination example
sysobjectid 1.3.6.1.4.1.5951.6
exactEngineID 0x80001f88805eacce40ca5b605e00000000
view nsview included 1.3.6.1
rouser netmonitor-vrops authPriv -V nsview
rouser azvision authPriv -V nsview
rouser MAS_nsmonitor authPriv -V nsview


Intitially, snmpwalk succeeds for 10-12 mins, but later it fails with Authentication failure which is puzzling. We are clueless on how to proceed ahead.

Workaround steps attempted:

  *   Deleted the user and re-added again. The behavior is same after certain time
  *   Changed the engine id. The behavior is same
  *   Deleted the user and re-added with MD5/DES. Polling is success without any errors in long run.
  *   Created a new user with another name and poll succeeds. The problem only seems to be with user:azvision


Thank you
Krishna Vivek

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