For some time we struggled with a lot of spam users (new fake accounts generated) at our wiki. Since using the Google reCAPTCHA (Extension:ConfirmEdit#ReCaptcha (NoCaptcha)) things have gotten better. But still sometimes fake accounts (and pages filled with, mostly Russian, spam text) are created, sometimes 1 per day, sometimes 5 per day, most days no fake accounts created. How is this possibly since bots cannot fill in a captcha (I presume)?
Topic on Project:Support desk
Okay ... Thanks. So now what? There is nothing to do against this?
Depending on the wiki, use QuestyCaptcha.
If you have sufficient access to the server, you can check from what IP they come from, and ban the entire IP range (the whois registry usually gives a hint about the IP range), specially if the IP is from a hosting company.
Thanks a lot. "ban the entire IP range": how? Also, it's from different ip-addresses. 99% = Russia
For banning IP address ranges, see Help:Range blocks.
(This is a test passage to follow up on T190429)