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We might want to consider locking registration until we can come up with a solution. The wiki isn't particularly active at the moment and there has been 166 registrations since they started on September 23 (and 1 which is questionable). None of them have posted a single thing. That averages about to around 10-11 new users a day.

I guess that would be fine for a few days, but if someone's willing to go to that trouble, why not just implement one of the solutions that have already been proposed, such as deleting accounts that only post with external links in their first few days, or your suggestion to have a hidden textbox that must be left blank?

That's true. I would do it, but I don't have shell access. So we have to wait for one of the senior admins.

Account creation temporarily disabled while I investigate what the best solution will be (starting with taking a close look at the server logs from the bad attempts)

Account creation is re-enabled.

I removed reCaptcha but in exchange made the math question slightly trickier. I also obfuscated the input field name to be a random string, and added two decoy fields like you mentioned Chase. One decoy is also named with a random string of the same form as the real one (and the ordering in the DOM is swapped at random), and the other decoy has the fixed field name that is normally used for a math captcha on Mediawiki.

We'll see if this keeps them out.

While I was at it, I also cleared out inactive users with a maintenance script.

Oh thankyou. That big list of names on the change log was causing me grief (and it made the atom feed about useless). Let's hope that this stall them for awhile. It isn't like they were able to post anyway, but the registration itself was getting annoying.

Thanks for the changes. It is nice to see only relevant changes in the log.

Thanks for the fix!

Yeah, thanks for doing that. The recent changes page looks a lot better.