Originally Posted by danielpmc
I have used CSF and set it up using Block Permanently all negative ips by using the LFD configuration. This will block IPs that attempt to login incorrectly or exploit your SSH port amongst other ports and various software.
when you first get a sever 2 things you should do straight away.
1) install CSF ( its free) and configure it.
2) change the SSH port number
your SSH port cannot be exploited so easily if you do not use the default port 22.
it is the same with emails you should change the outgoing mail (SMTP) port from the default 25