What redirect code (301,302,303) should I use for pages that are available only for logged in users?

[STEFANOAGBAGLA]

If for example they go to a page like /premium-content, they will be automatically redirected (302) to the login page.

Because now I do a 302 redirect, in Google Webmaster Tools it sais I have duplicate title issues for each of the pages that are accessible only for the logged in users.

If I would do a 301 redirect, I basically tell Google that those pages are moved, but it is not the case because logged in users will see those pages.

[zigojacko]

How can Google Webmaster Tools be reporting duplicate title issues for pages that can only be accessed if you are logged in? If pages of your website require authentication then they are inaccessible to search engines so subsequently, cannot be reported on.

Unless I have misunderstood?

[STEFANOAGBAGLA]

Because they redirect to the registration page, and Google see's /premium-content as the /register page (same title as register page)

[zigojacko]

Just block /premium-content from your robots.txt page then (or include a meta noindex on the page if you can). There's no reason for it to be indexed I presume if it only redirects to your registration page and can't be access without authentication?

Disallow: /premium-content/