If you no longer want to allow external users who are not fully authenticated to have access to a particular internal location, remove the IP address from the Trusted Internal IP Address table.
To remove a trusted internal IP or trusted external IP address
In Symantec Endpoint Protection Manager, click Admin.
Select and expand the Gateway Enforcer appliance group.
Select the group of Gateway Enforcer appliances for which you want to remove a trusted internal IP or trusted external IP address.
Under Tasks, click Edit Group Properties.
In the Gateway Settings dialog box, on the Auth Range tab, in the Trusted IP address range area, select Trusted Internal IP address range or Trusted External IP address range from the drop-down list.
The addresses for the selected type appear in the table.
In the table, click the row containing the IP address that you want to remove.
In the Settings dialog box, click OK.