The Qualys Gateway Service Appliance extends the reach of the Qualys Cloud Platform's integrated suite of security and compliance SaaS applications into the internal networks of both Amazon VPC and EC2-Classic. The QGS appliance provides caching and proxy services for your Cloud Agents, Virtual Scanner and Passive Sensors hosted on Amazon infrastructure, so that your VPC, EC2 Instances and other AWS artefacts can be assessed at close range from trusted devices under your control and protected by your EC2/VPC Security Groups. Customers configure and operate all of the QGS's security services from their Qualys (SaaS) account via a secure web interface.

Each instance of the Qualys Gateway Service Appliance must be associated with a valid Qualys (SaaS) subscription in order to function. It is available for use by licensed Qualys customers and trial users.