google crawler

i have a total of 168 site maps records amounting to 8.2 Million. I see that all my sitemaps has content. However Google says couldn't fetch data. Out of 161 sitemap.xml . I see that google has fetched only 3 files. rest all the file status says Couldn't fetch. Can any pros help me here

I'm trying to add login access to the Adsense google bot for pages hidden to guests. I have a few questions about configuration and how it works. 1. Do I have to enter multiple crawler logins for each directory I want to extend access to? Is it sitewide or recursive? 2. Guests can see one...