Blocking Destructive Users from Websites?

billmarrs asks: "I occasionally need to block a user from using my website because they are abusing the system in some way, but the tools I have to work with for blocking them are easily circumvented. Once I identify them, I can block their IP; but they can just hang-up their modem and dial-in again to get a new IP. I can also stick cookies in their browser to identify them, but they can delete the cookies (or turn them off altogether). Are there other ways to block unwanted users from one's website?"

Comments

Incredible physics is being moderated up

[Anonymous Coward]

It's really surprising how long some people can persuade moderators that their wildly misleading incorrect post on quantum mechanics is in fact worthy of Einstein and should be moderated up to +3 while ignoring a correct explanation of the real physics

Learn from Slashdot

[J'raxis]

Slashdot has come up with metric buttloads of different ways to block people in their never-ending arms race with the trolls lameness filter and other content-based filters, account banning, IP banning. None of it works right and can be circumvented in about 5,421,234 different ways (rough estimate), but its a start. Theyve been working on it for about three years, but... well, its still a start.

(Here is the Slashdot source code.)