In nginx.conf

limit_zone xxxxxx $binary_remote_addr 1M;
limit_req_zone $binary_remote_addr zone=xxxxxx_freq:1M rate=30r/m;

In site definition
limit_conn xxxxxx 3;
limit_req zone=xxxxxx_freq burst=1 nodelay;


First connection usually gets a 503, subsequent ones work.

First connection usually refers to a dir without / final, then another with / is requested, then dir/index.php.

Any help will be appreciated.
Thanks,
Gerardo