This is something people must be waiting for long time , GOOGLE ADSENSE have made changes to their crawler wherein the crawler can access pages after login. This is great for publishers who have very good content and that is accessible only after login. As Google mentioned that it has been difficult for the crawler to crawl the pages behind login and the result is that your users end up with poorly targeted ads and the AdSense Crawler ends up with sleepless nights, wondering what could have been -- if only it had crawled those pages. So there is new feature been launched called Site Authentication to take care of this problem. Using Site Authentication, you can give Adsense crawler access to your login-protected pages by passing it information to log into your site. For example, let's say your news site has a premium content area, with articles that only paying members can access. To get ads on those pages, you can use Site Authentication to provide crawler with a test username and password. It's an easy process that starts just by logging into your AdSense account and finding the 'Site Authentication' link under the 'AdSense Setup' tab. Once you've supplied google with a username, password, and a few other details, all you have to do is verify that you own the site through Google Sitemaps. If this sounds a little complicated, don't worry -- just check out Site Authentication in your account and follow the instructions on the page. Please note that you will only have access to this feature if you've updated your AdSense login to a Google Account. We appreciate your patience as we roll out this feature to additional publishers.