Riddle me this... Why would a server be successfully discovered and inventoried, but then also show up under Unknown after the daily scheduled inventory/discovery tasks? After which, I see it listed under Servers by name and also under the Unknown section by IP address. I then Perform Discovery and Inventory Now on the 3 troublesome servers and they disappear from Unknown.
I have my discovery ranges broken into groups and under each group I have single IP targets labelled by server name. I am 100% confident there are no firewall blocks at play and the SNMP config is pushed via group policy. Running it manually to success tells me everything is working as intended.
The troubleshooting tool passes fine for both SNMP and WMI. Are there logs I can look at to figure out what is going on with these 3 servers? 50 others are working fine...