Enable FortiGate user authentication by creating a user group named Sales and adding a user named wloman to this group. Then add an identity based policy to a security policy that accepts connections from the internal network to the Internet. Add the Sales user group to the identity based policy. Test the configuration by authenticating with the FortiGate unit and viewing the information displayed in the user monitor.

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The original article/video can be found at FortiGate Cookbook – Creating a Security Policy to Identify Users