For those of you who are getting DoS attacks and whatnot on your CentOS server, you might want to first make sure you have only WWW (port 80) and SSH (port 22) open.
You can do this with iptables (which is pain is the a**) or just use this:
yum install system-config-securitylevel
Then do:
/usr/bin/system-config-securitylevel-tui
And there’s a “Customize” menu where you can set WWW and SSH open.
