Ok so the Googlebot-Image bot is crawling your site and there is no HTTP_REFERER since this is bot activity. When I check your site: akxxxx-wexxxx.hu I see the thumbnail images in your sidebar widget and do not see a 403 error. So the Googlebot-Image bot 403 errors are nuisance errors. You can either do one of the methods in this forum topic: http://forum.ait-pro.com/forums/topic/googlebot-googlebot-image-403-error/ so that the nuisance 403 errors are no longer being logged or you can just ignore them. The Googlebot-Image bot is able to successfully crawl, retrieve and index your image files on your website, but something else in the crawling script is being blocked. In other words, everything is working fine and the 403 errors are just nuisance errors.
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