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I have a bit of a problem on my website: a problematic visitor, who basically I want to ban, but I can't ban his IP since it is dynamic. If I ban the whole IP pool then this also blocks all other users on his ISP, which I don't want to do. I could require email subscription to view the website and write on the messageboard, but this would put a lot of users off and there is nothing stopping this guy from getting as many free email addresses as he wants and signing up again and again each time I ban him.
Can anyone suggest any way to get enough information to ban him permanently? Like a combination of the first two bytes of the IP address (which are static) and information such as the browser he uses and OS (unforunately he uses the most common options, windows XP and IE 6.0 so can't really ban everyone with his ISP and that OS and browser either). Any suggestions on how to ban him? The site is in ASP so I can do anything server side scripting allows...
thanks in advance
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Too set in his ways to ever relate
If he could set that aside, there'd be heaven to pay
But weathered and aged, time swept him to grave
Love conquers all? Damn, I'd say that area's gray
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