I had the same problem banning the ip doesn't help, banning the username doesn't help.
I finally found a solution that works for me,
If you forum is about a topic that the real members that join your forum should know something about , then thier is a hack that lets you put a question in that the new registrations must answer, correctly.
This will stop the bots,
So if your forum is about lets say horses,
I would have the following question, you need to keep it simple, but effective.
what is the height of a horse measured in?
answer = hands
Be supprised how that will stop the robut and most of the spammers.
The hack is called spam stop I think
Hope this helps
Otis
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