Hi; I have changed the mod_security setting 3 days ago. i was looking for the mod_security logs. 2008-05-14 06:45:48 74.125.16.35 /article-title.html mysite.com Access denied with code 406 (phase 2). Pattern match "Linux" at REQUEST_HEADERS:User-Agent. 74.125.16.35 is one of the ips of google. the related rule of mod_security is below. SecRule HTTP_User-Agent "Linux" can somebody explain me what it means? does it block the google crawl? Thanks