Where Network Access Control (NAC) is enabled you must have ForeScout SecureConnector installed for network access
Windows 32-bit Installer
https://rc.partners.org/media/559
Windows 64-bit Installer
https://rc.partners.org/media/558
Macintosh Installer
https://rc.partners.org/media/560
Mac users can also find ForeScout SecureConnector app in the Mac folder /Applications/Self Service