PLANET CS-2001 - Manual (Page 214)

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Step 26. Under Policy > Outgoing, set as below:
（Figure 8-67）
 Select the defined user group for Authentication User.
 Click OK.
（Figure 8-68）
Figure 8-67 Using LDAP Authentication in a Policy
Figure 8-68 A Policy with LDAP Authentication
Step 27. The authentication login screen appears in the web browser when a
LAN user tries to access the Internet. Internet access will be available after
applying the valid user name and password to the corresponding fields in
the login screen.
（Figure 8-69）
Figure 8-69 The Authentication Login