The Cloud computing model is considered as a very promising internet-based computing platform, the resources it provides to create virtual machines are rarely used to manage security. Researchers used this power in a new way, in order to offer new security services based on Cloud paradigm to copc with threats such as DDOS (Distribute Denial Of Service) attacks, using the extensible resources and other Cloud's characteristics. Our model is based on the SECaaS (SECurity as a Service) to manage security using specialized virtual firewalls proposed as a service by the Cloud Provider. The main advantage of this approach is to instantiate firewalls when needed and adapt resources to filter the network flow avoiding bottlenecks and congestion. In this paper, we present a new autonomous model to manage cloud based firewalling services using the Multi-Agent System. The aim of this solution is to manage and provide optimal resource provisioning for this type of service.