Google Webmaster Tools Breaks Down Site Errors
The Google Webmaster Central blog announced that Now Webmster can get website Error information with more detailed in Webmaster Tools and this information is much useful for webmasters. Now Google Websmater is showing errors by each category with more specific errors.
For example, if your site have a problme in Server connectvity then your website is not accessible to GoogleBot. Google show this error in a DNS issue or server is down or maybe a robots.txt file preventing access. also Google will display all ststatistics for each of your site-wide crawl errors from the past 90 days.