I have looked through the Admin guide and the often referenced Cisco doc on SNMP v3. I have gone through the many posts on it as well. So I am starting to think I am doing something uniquely dumb.
Below is my Cisco switch config, I know there is some overlap on the views but I just kept getting broader to try and fix the problem. In NPM it says credentials fail, however when I use the SNMP Tester tool in the engineer toolset I get a more specific error.
ERROR: SNMPv3 - Unsupported Security Level - Either the requested MIB is not readable for this username, or this username requires a higher level of authentication / encryption.
Cisco SNMP config:
snmp-server group GROUPNAME v3 auth read view_all write view_all access 6
snmp-server view view_all iso included
snmp-server view view_all internet included
snmp-server view view_all system included
snmp-server view view_all interfaces included
snmp-server view view_all chassis included
snmp-server community public RO 5
snmp-server host 10.27.28.5 public
The last 2 lines are there so I can still monitor the switch while i figure this out.
I used this to config the user:
snmp-user USERNAME GROUPNAME v3 auth md5 PASSWORD access 6