From the Create Login Application and Modify Login Application pages, you can select the Disable option to disable a login application, thereby preventing users from logging in. If a user tries to log in to a disabled application, the user is redirected to an alternate page that states that the application is currently disabled. You can edit the message that displays on this page by editing the custom catalog.
Login applications remain disabled until you deselect the option. As a safeguard, you cannot disable administrator login.