Essentially, same fix you have done to make ZB Block work.
Regards
dev101, i don't know if you're giving "guess" solutions or wrote the answers in a hurry.
But i took a fair amount of time to study what might be going wrong with my server. Let's start with your latest reply "Essentially, same fix you have done to make ZB Block work." - i don't know what is this. ZBBLOCK was not working on my server becuse the www-data user was not able to write.. this has nothing to do with this error.
Getting back to the 3 points. Your answers -
1 & 2 - Bots --- (it's obvious we know that)
3 - Bad configuration -- What do you mean by just "bad". You've gotta give an explanation on how you came to this conclusion. Just by saying "not right or incorrect" does not mean anything.
Now, what was happening was, some jerks have been buying data servers from remote locations and have been botting my server using IPs from USA. I got to know this recently when i installed a bot protection system called shieldsquare.
By the way, i configure my server by reading documentations from DigitalOcean and Linode, they are considered to be very well written among developers (and yes i read them very thoroughly). So gentlemen, please don't provide wrong information if you're not sure about the problem.
Regards,