It is a cPanel server and from /var/log/exim_mainlog, I can see that, there are too many connections to the server. Mostly the number of action connection will be less than 25. But even after increasing the maximum connection from 100 to 150, still we are getting too many connection problem.2016-03-11 15:33:24 Connection from [216.113.172.65]:59122 refused: too many connections2016-03-11 15:33:25 Connection from [216.158.225.200]:44107 refused: too many connections2016-03-11 15:33:25 Connection from [213.61.222.76]:53953 refused: too many connections2016-03-11 15:33:27 Connection from [46.23.76.98]:42336 refused: too many connections2016-03-11 15:33:27 Connection from [91.194.248.147]:37566 refused: too many connectionsLooks like SMTP server is kind of under attack or something like slowloris.How can I solve this problem ? Open rely is not allowed in server. We have verified it.
too many connection to SMTP server in exim_mainlog, How to solve it?
centos;smtp;mailx;exim;cpanel