Is there a way to block people from accessing my site if they came from a certin url?
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I think that will deny all users who connect from a computer on the site-xyz.com domain. The original poster was asking about referalls. I'd probably use a simple PHP script to check the HTTP referrer variable and forward the user to an access deny page if they came from site-xyz.com. However, this is fairly easily circumvented, since browsers can be configured not to send referrer data. You can of course check for a valid referer, but this will probably block some amount of legitimate traffic.