--- Comment #1 from Tomás Cohen Arazi <[hidden email]> ---
The only solution I find, is providing a message with a logout from CAS
- In case the user is not a valid Koha user 'The CAS user is not a valid Koha
user, please logout if you want to try another user'
- In case the user does not have the right permissions 'The CAS user doesn't
have the required permissions, please logout if you want to try another user'