The web client is calling:
Roughly three times per minute, the logs returning a 400 response. This is messing with fail2ban, which uses the line:
failregex = <HOST>.*\" 400
to ban hosts that get more than 10 HTTP 400 response codes in 10 minutes.
bench enable-scheduler to enable the scheduler, and I don’t know why I’m getting the 400 error. The protection fail2ban offers is very real and welcome, so I want to fix the problem rather than handicap fail2ban.
How can I troubleshoot the 400 error?