I have a website where users can create an account. Currently, if they are banned, it will just mean that they cannot view the site logged into the banned account. They can perfectly easily delete the cookie, register for another account, and wreak more havok. I (think) that I can get their IP address (using ASP) Server.RequestVariables("HTTP_REMOTE_ADDR"), or something like that at least. Thing is, more than one person can have the same IP address (AOL users especially), and I dont want to stop someone who hasnt done anything wrong from accessing my site. So what I want to know is if there is any way that I can uniquely identify a site visitor which will enable me to stop them from viewing the site if I so wish. Short of that, how can I find out their ISP so I can speak to their ISP in the event of very serious offences.
Thanks a lot