Hot links are the links on your site that are most likely to need attention. They include links that gave a problematic response (like a 404) as well as links that Nikita couldn't check. The following conditions are typical reasons that Nikita can't check a link:
Nikita considers the following response codes problematic – 301 (Moved Permanently), 303 (See Other), 305 (Use Proxy), 306 (Unused), anything in the 400 ("Client Error") series, anything in the 500 ("Server Error") series, and any code not specified in RFC 2616.
Links from pages that contain a META robots NoFollow tag are not listed here.
http://nikitathespider.com/
http://nikitathespider.com/users/login.spy