Security start-up CloudPassage is offering two free services to protect cloud-based virtual servers. The services are designed for businesses that hire public cloud providers for infrastructure as a service. The company’s services are based on a platform that monitors virtual servers even as they replicate. The platform consists of two components, Halo Daemon and Halo Grid. It checks that servers meet configuration and policy settings as determined by customers and detects weaknesses. Later this year the company will add advanced features to these services and charge.”]