Thanks Ron for pointing to the new improved search on the extreme networks corporate site, that does have the ability to filter for knowledge and community (The Hub) sources.
Darren, does Ron's search link work ok for you? should take you to the extreme networks search page with a search for "Login failed through SNMPv3 not in life time" with Knowledge and Community filters selected. There are a handful of knowledge articles found, one looks like it might be helpful. Let us know if the search works for you!
We hope to soon have an even better search in the new support portal more which is in beta right now.