Abstract: Global SOA requires a dynamic and ubiquitous security which cannot be provided by the SOA due to its static and pre-configured nature. Security is the major barrier for migrating SOA from intra-enterprise to the web. In this paper we are defining the security risk associated with the Global SOA and proposing the handler mechanism to prevent Denial of Service attack in a Global SOA environment. Our method emphasizes on the DoS attack on Web Services and suggests counter measures through the use of dynamic handlers.