Abstract: Logged-in-user-specific 802.1x security can be applied on a multi-user client computing device. An 802.1x extension can be provided on a multi-user client computing device to leverage user credentials that are verified to log a user into the multi-user client computing device to select and perform 802.1x authentication for connecting the multi-user client computing device to a LAN. The 802.1x extension may also leverage the user credentials to obtain and use one or more certificates as part of the 802.1x authentication. When the user logs off of the multi-user client computing device, the 802.1x extension can automatically disconnect the multi-user client computing device from the LAN to prevent a subsequently logged in user from obtaining unauthorized access to the LAN.