- Don't make enemies.
- Don't promote immoral, unethical, sectarian, political, inhumane, anti-intellectual property products or services.

The list can continue, even to things you assume are good. Just don't piss off the wrong nerd.

A way to beat them to it if you know who is against your organization is to research the person and take control of their botnet before they tell it to kill your server.

Or the aftermath approach, take the server down, analyze all your logs and determine which sequences were of a DDoS style and ban all those IP's when you associate your server to a new IP/and/or hosting service.