Recently we had faced a problem in a Drupal site after installing Memcached on a server with CentOS and having csf as firewall. Memcache is a process which is always running in memory and the server is configured to send automated mails regarding this process. So we need to exclude this process from csf. If you are facing the same problem in your Drupal site and want to know how to whitelist a process in csf, then read on to get the solution
