XF 1.2 can't set rights for guest user

I have just built a forum. I want to show a login Form when visitor visit my forum. I set "never" rights for guest users but I have some errors:
"403 - Forbidden: Access is denied.You do not have permission to view this directory or page using the credentials that you supplied."
if i set "view" rights for guest users. it shows contents of forum!
have anyone got any idea to resolve this issue?
 
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