Require Login for Selected Pages
Sends visitors who are not logged in to the login screen when they open the pages you list, and brings them back to the page after they log in.
Snippet Library
Redirects snippets for WordPress
Snippets that send visitors where they should go: redirect after login or logout, from attachment pages, old URLs and empty searches, or to a maintenance page. Quick fixes when you only need a few redirects, not a redirection plugin.