how do i get my Solarwinds product to communicate with my ForeScout applications?
This is quite easy.
In the the counteract management options.
Go to Options -> General
There you can configure your SNMP Settings.
On the SNMP Settings General TAB.
Enable Use console-based configuration and enable Run SNMP Service
On the User TAB
Configure here your SNMP Community Name, your Sources and enable a view.
This should do it.