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Access Key: Enter the Access Key you want to use. The only way you will be able to log in to the administrator is by typing administrator followed by question mark and then the Access Key.
Whitelist IP Addresses: These IP Addresses (separated by comma e.g. 127.0.0.1 , 127.0.0.2) don't need to use the Access Key to enter the Joomla backend.
Your IP Address: Here you can see your current IP Address, Just copy and paste it to the field above when you would like to Whitelist this Address.
Action on Failure: Choose an action when No or a Wrong Access Key is used.
Message: (only visible when Action on Failure is set to Show Message) This message is displayed if the Access Key is not provided. The administrator login screen is not available for this visitor.
Redirect: (only visible when Action on Failure is set to Show Message) URL where a user is redirected to when no Access Key is provided. Leave empty to redirect to the Joomla Root / Frontend.