[xwiki-users] How to define a redirect page when a page is denied for a user

Hi, all, I got a problem whenever a user is denied access to a page, it is then redirected to a localhost on the client browser machine, I defined the some workspaces or pages are not allowed for unregistered users, then when a user tries to login, it will redirect the user to localhost/xwiki/bin/view/Main/WebHome. Also how to setup the rights for XWikiLogin page?, since admin can only set up rights after admin login and admin has to go to that page to setup rights. Thanks for your help. Dave