The cloud can be a great investment for most organisations. It offers the promise to significantly increase capacity and agility, while simultaneously reducing costs.

Companies invest significant resource to attain a great ROI in the cloud, but if that investment isn’t secured, migrating could turn out to be a disaster.

Most cloud adopters underestimate the philosophical and technological change required to security when migrating to the cloud. It’s a problem that affects organisations of all sizes, whether they have a few or a few hundred cloud servers. So, to help these and others, we’ve put together the following list of the five most common cloud server firewall mistakes to avoid:

#1: Too many rules = Trouble

In development, you typically start with just a few rules in your cloud firewall or Amazon Security Groups. By the time you get into production, however, the list of rules and policy …