http://www.educationboard.in.th/: 
Increase in authorization permission errors29 กรกฎาคม 2556
Google detected a significant increase in the number of URLs we were blocked from crawling due to authorization permission errors.
Recommended action
Check the Crawl Errors page in Webmaster Tools.
Check if your server or host is blocking Googlebot.
If you don't want Google to crawl these pages, consider adding them to your robots.txt.
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