ReCaptcha is not working in q2a 1.8 and results bot registration

Question

I am very upset due to so many bot registration per day.
ReCaptcha plugin do not stop bot registration.
All other stop spam plugin also do not stop spam

How can I get rid of spam registration.
Somebody provide resolution for this problem.

Comments

Same question here:
http://question2answer.org/qa/64143/stop-spam-registration

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Do you have proof they are bots? I’ve been looking into this and as far as I can tell from server logs and such they are real people posting spam.

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Hello Scott
I am 100% sure. Recaptcha was working fine in my website for 4 years ! And it's about 2 month that I am getting alot of spam registration! I had to change my captcha to Kai's plugin.

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@fara that doesn’t mean they are bots. Have you checked your server logs?

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@Scott
How can I check my server log? So what are they? If they are not bots why it has stopped after changing captcha plugin?

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Depends on your hosting. But the server logs I looked at on this site showed requests appearing to come from regular web browsers (Chrome/Firefox etc) and loading all files (stylesheets etc) which is consistent with a web browser and not spam bots.