SNMP request from an unknown SNMP community aaa
This probably means that the community configuration does not match your Solarwinds setup. Please check the following.
community
Configuration > Report Settings > SNMP
Create or edit your community name aaa
You should also restrict this community to the ip address that your solarwinds has for NAT on the internet so only this device will be allowed to poll
allow snmp on interface
Network > Interfaces > List
edit the interface that the SNMP request will come in on
Check that SNMP is allowed on this interface