Author: H.User1325 (17 Jul 12 10:21am)
You say "try to log-in" so that is good. If they are failing that tell me that your security is working.
From other security/spam forums I read, I understand that for the last 2 weeks or so there has been a major up-tick in the activity of the world wide bot nets. This include sending spam, some with a virus load some just junk, and comment spammers. The two phpBB forums have had several failed logins, NOT 200! They must "like" you today.
The good news is if they are not getting in, they will go away. Sounds like your your current controls are working. Make it harder and "real" people won't bother to finish the login process.