Dell Networking N4000 Series Configuration Manual page 556

13 Customize the look and feel of the Logout Page, such as the background
image and successful logout message.
14 Click Apply to save the settings to the running configuration or click
Preview to view what the user will see. To return to the default views, click
Clear.
Local User
You can configure a portal to accommodate guest users and authorized users.
Guest users do not have assigned user names and passwords. Authorized users
provide a valid user name and password that must first be validated against a
local database or RADIUS server. Authorized users can gain network access
once the switch confirms the user's credentials.
By default, each Captive Portal instance contains the default group. The
default group can be renamed, or a different group can be created and
assigned to each Captive Portal instance. A Captive Portal instance can be
associated to one user group only. A user, however, can be assigned to multiple
groups.
The Local User page allows you to add authorized users to the local database,
which can contain up to 128 user entries. You can also add and delete users
from the local database from the Local User page.
To display the Local User page, click System → Captive Portal → Local User.
Figure 19-24 shows the Local User page after a user has been added. If no
users have been added to the switch, many of the fields do not display on the
screen.
NOTE:
Multiple user groups can be selected by holding the CTRL key down while
clicking the desired groups.
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Configuring Port and System Security