How to secure sys_home and redirect to login for unauthenticated users

[Ling Ling Low]

Hi

I like to redirect unauthenticated user to login when they try to access https://<instancename>.service-now.com/sys_home directly. I am using Vancouver Release.

Currently, an empty page is displayed:

Instead of showing the empty page, i like to either show a message that  says 'not authorised' or be redirected to the login page.

Under sys_security_acl_role_list I have remove role = 'public' and added role  'snc_internal'.  

Is there some other settings to config? 

Thanks for any help!