After installing MediaWiki on my website it's working good. I found several extra apps... installed them and enjoy using them. So far ... so good.
This morning i see a very lot (about 21000) new users who has nothing to do with this website. I have deleted them all by using PhP Admin / page 2 / eh3j-user. It looklikes a "user-bomb" was used to attack my website. Is there a way to avoid such a "user-bomb"?