with Orion log viewer , why i can't receive syslog messages from unmanaged devices ?
Do you mean devices your not monitoring within SolarWinds? Log Viewer is Node-based, so for every log that SW receives it needs to tie that message to a NodeID. If your node isn't monitored in SW it will drop the packet and tell you that you have messages from an unknown source.
Goto Settings > All Settings > Log and Event Settings
This will show you a link to a report called "Show unmanaged log senders" which you can use to see which devices are sending you logs that you don't have in SW.
so in this case , i have to manage the node in order to see the logs sent by it !? i remember that i was able to receive and view the syslog from unmanaged device before adding the orion log view .
