Just recently, I discovered great pice of software named fail2ban. Supreme way to provide some additional security to your server. But more about fail2ban next time. So, I configured my jail.local configuration, but getting errors in error log. This was the error:
Error in FilterPyinotify callback: illegal IP address string passed to inet_aton
Error is pretty self explanatory, my whitelisted IP’s defined in variable ignoreip were wrong. If you use commas (,) like I did, then there is your problem. Just replace commas with spaces and it should work fine.