Disable registration for users coming from specific site

[rady]

This might be a very long shot but i'll try my luck. Is there anyway to disable registration if the user visited a specific site in the last x hours? I'm getting a lot of trolling from a fellow message board and it's quite difficult to tell which new members joined to talk facts and which are the ones who come for trolling.

Any help is much appreciated!

Thanks in advance!

i posted this at vb.com and they suggested to try my luck here since they don't support older version like i have (3.6.7) anymore

[BirdOPrey5]

You couldn't possibly do this unless the other site was willing to cooperate, which my guess is they aren't. Or you could put a virus on everyone's computer to track them, but again not legal or practical.

[Xtrigit]

You can't stop trolls.