@mex

Yes it seems that it will help me :)

But on the code he is not using limit_conn_zone at all ....

My code:
http{
limit_req_zone $binary_remote_addr zone=delta:8m rate=30r/s;
limit_conn_zone $binary_remote_addr zone=alpha:8m;


New code:
http{
limit_req_zone $binary_remote_addr zone=notabot:5m rate=200r/s;
limit_req zone=notabot burst=200 nodelay;

What is the difference?