Why I am seeing SNMP authentication failure syslog messages – %SNMP-3-SNMP_AUTH_FAIL: SNMP Authentication failure for SNMP request?
A. When you have configured an access list for limiting SNMP gets to select number of hosts, this message may be indicating that your switch has been scanned or is under a security threat. In earlier versions of FTOS, this message also reported a community string authentication failure. In later versions of FTOS, when an SNMP ACL deny with the log ACL keyword is configured, FTOS reports %SEC-6-IPACCESS: access-list LIST_NAME denied.
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