SonicWALL SMA 100 Series User Manual page 15

Enforce Client Source Uniqueness
Remote connectivity to a network should only be allowed from one device at a time. This setting will only
allow once unique device to connect at a time. Trying to connect with a second device using the same
username would deny access to the second device attempting to connect.
SonicWall SMA 100 Series
15
Security Best Practice Guide