"Security Alert!!!" error occurs when you click the "pab replicate" button.
This error mostly appears if the users do not have permissions to create replicas on the Notes server.
Check the "All Servers" document in Notes, under the "Security" tab and verify that all users have access to create replicas. To set this for all users you can set the value to a wildcard such as "*".
In order to create replicas the user needs to be able to create a database. This is also set in the security tab.