Planet MH-2300 User Manual page 146

Step 5. Go to Policy > Outgoing and then set as shown below:
Select the authentication group for Authentication.
Click OK to complete the settings.
Creating a Policy to Apply the Authentication Group Settings
Step 6. The group members will be prompted for their authentication
credentials to access the Internet. Click Login to complete the
authentication procedure.
Policy Successfully Created
The Authentication Prompt Screen
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Gigabit Multi-Homing VPN Security Gateway
MH-2300