in the past couple of weeks we had a permanent problem with spam bots. Our forum is based on WBB4 and has reCaptcha enabled during the registration process. This normally prevents bots from registering and starting to spam the forum with meaningless postings.
I guess there are various hacks out there which allow to "crack" reCaptcha, or by paying someone to do that on a manual basis. In either way, reCaptcha does not prevent those bots from registering. Yesterday there were round about 300 postings during the mornings. We need to manually remove them and ban the users.
Since there is no immediate solution to this issue other than workarounds, I've disabled the registration and am requesting administrators to review and activate new accounts. This is not as good as it sounds as you will have to wait for someone to active your account. Please be patient.
Probably there is a better method but from our first analysis of registered IP addresses, this ranges from Korea, Taiwan, US west coast, to anything you cannot really block by simple filters.
Stay tuned for updates,
Edit: Rephrased after a frustrated first post. Thx for the feedback guys.